This handy Spectrum Math Grade 4 Answer Key Chapter 3 Lesson 3.9 Addition and Subtraction Practice provides detailed answers for the workbook questions.

Question 1.
a.

Addition of 39741 with 4372 then you get 44113.

Explanation:

By adding 1 with 2 we get 3.

By adding 4 with 7 we get 11. So add 1 to the hundreds place.

By adding 1, 7 and 3 we get 11. So add 1 to the thousands place.

By adding 1, 9 and 4 we get 14. So add 1 to the ten thousands place.

By adding 4 with 0 we get 4.

b.

Addition of 75103 with 1789 then you get 76892.

Explanation:

By adding 3 with 9 we get 12.

By adding 1, 0 and 8 we get 9.

By adding 1 with 7 we get 8.

By adding 5 with 1 we get 6.

By adding 7 with 0 we get 7.

c.

Addition of 34396 with 33715 then you get 68111.

Explanation:

By adding 6 with 5 we get 11. So add 1 to the tens place.

By adding 1, 9 and 1 we get 11. So add 1 to the hundreds place.

By adding 1, 3 and 7 we get 11. So add 1 to the thousands place.

By adding 1, 4 and 3 we get 8.

By adding 3 with 3 we get 6.

d.

Addition of 60056 with 13051 then you get 73107.

Explanation:

By adding 6 with 1 we get 7.

By adding 5 with 5 we get 10. So add 1 to the hundreds place.

By adding 1, 0 and 0 we get 1.

By adding 0 with 3 we get 3.

By adding 6 with 1 we get 7.

e.

Addition of 9408 with 2592 then you get 12000.

Explanation:

By adding 8 with 2 we get 10.

By adding 1, 0 and 9 we get 10. So add 1 to the hundreds place.

By adding 1, 4 and 5 we get 10. so add 1 to the thousands place.

By adding 1, 9 and 2 we get 12.

Question 2.
a.

Addition of 1515 with 1212 then you get 2727.

Explanation:

By adding 5 with 2 we get 7.

By adding 1 with 1 we get 2.

By adding 5 with 2 we get 7.

By adding 1 with 1 we get 2.

b.

Addition of 10768 with 9275 then you get 20038.

Explanation:

By adding 3 with 5 we get 8.

By adding 6 with 7 we get 13. So add 1 to the hundreds place.

By adding 1, 7 and 2 we get 10. So add 1 to the thousands place.

By adding 1, 0 and 9 we get 10. So add 1 to the ten thousands place.

By adding 1 with 1 we get 2.

c.

Addition of 66804 with 32198 then you get 99002.

Explanation:

By adding 4 with 8 we get 12. So add 1 to the tens place.

By adding 1, 0 and 9 we get 10. So add 1 to the hundreds place.

By adding 1, 8 and 1 we get 10. So add 1 to the thousands place.

By adding 1, 6 and 2 we get 9.

By adding 6 with 3 we get 9.

d.

Addition of 2575 with 1984 then you get 4559.

Explanation:

By adding 5 with 4 we get 9.

By adding 7 with 8 we get 15. So add 1 to the hundreds place.

By adding 1, 5 and 9 we get 15. So add 1 to the thousands place.

By adding 1, 2 and 1 we get 4.

e.

Addition of 25788 with 17875 then you get 43663.

Explanation:

By adding 8 with 5 we get 13. So add 1 to the tens place.

By adding 1, 8 and 7 we get 16. So add 1 to the hundreds place.

By adding 1, 7 and 8 we get 16. so add 1 to the thousands place.

By adding 1, 5 and 7 we get 13. so add 1 to the ten thousands place.

By adding 1, 2 and 1 we get 4.

Question 3.
a.

Addition of 13362 with 44202 then you get 57564.

Explanation:

By adding 2 with 2 we get 4.

By adding 6 with 0 we get 6.

By adding 3 with 2  we get 5.

By adding 3 with 4 we get 7.

By adding 1 with 4 we get 5.

b.

Addition of 45245 with 2163 then you get 47408.

Explanation:

By adding 5 with 3 we get 8.

By adding 4 with 6 we get 10. so add 1 to the hundreds place.

By adding 1, 2 and 1 we get 4.

By adding 5 with 2 we get 7.

By adding 4 with 0 we get 4.

c.

Addition of 74612 with 3400 then you get 78012.

Explanation:

By adding 2 with 0 we get 2.

By adding 1 with 0 we get 1.

By adding 6 with 4 we get 10. So add 1 to the thousands place.

By adding 1, 4 and 3 we get 8.

By adding 7 with 0 we get 7.

d.

Addition of 45220 with 1399 then you get 46619.

Explanation:

By adding 0 with 9 we get 9.

By adding 2 with 9 we get 11. So add 1 to the hundreds place.

By adding 1, 2 and 3 we get 6.

By adding 5 with 1 we get 6.

By adding 4 with 0 we get 4.

e.

Addition of 4998 with 3975 then you get 8973.

Explanation:

By adding 8 with 5 we get 13. So add 1 to the tens place.

By adding 1, 9 and 7 we get 17. So add 1 to the hundreds place.

By adding 1, 9 and 9 we get 19. so add 1 to the thousands place.

By adding 1, 4 and 3 we get 8.

Question 4.
a.

Addition of 371 with 287 then you get 658.

Explanation:

By adding 1 with 7 we get 8.

By adding 7 with 8 we get 15. So add 1 to the hundreds place.

By adding 1, 3 and 2 we get 6.

b.

Addition of 2513, 727 and 236 then you get 3476.

Explanation:

By adding 3, 7 and 6 we get 16. So add 1 to the tens place.

By adding 1, 1, 2, and 3 we get 7.

By adding 5, 7 and 2 we get 14. So add 1 to the thousands place.

By adding 1 with 2 we get 3.

c.

Addition of 937 with 793 then you get 1730.

Explanation:

By adding 7with 3 we get 10. So add 1 to the tens place.

By adding 1, 3 and 9 we get 13. So add 1 to the hundreds place.

By adding 1, 9 and 7 we get 17.

d.

Addition of 815, 673 and 295 then you get 1783.

Explanation:

By adding 5, 3 and 5 we get 13. So add 1 to the tens place.

By adding 1, 1, 7 and 9 we get 18. So add 1 to the hundreds place.

By adding 1, 8, 6 and 2 we get 17.

e.

Addition of 7035, 1293 and 713 then you get 9041.

Explanation:

By adding 5, 3 and 3 we get 11. So add 1 to the tens place.

By adding 1, 3, 9 and 1 we get 14. So add 1 to the hundreds place.

By adding 1, 0, 2 and 7 we get 10. So add 1 to the thousands place.

By adding 1, 7 and 1 we get 9.

Subtract.

Question 5.
a.

Subtract 2147 from 5703 then you get 3656.

Explanation:
Subtract the ones:

By subtracting 7 from 3 is not possible. So take the borrow from tens.
13 – 7 = 6
Subtract the tens:

By subtracting 4 from 9 we get 5.
Subtract the hundreds:

By subtracting 1 from 7 we get 6.
Subtract the thousands:

By subtracting 2 from 5 we get 3.

b.

Subtract 7616 from 13817 then you get 6201.

Explanation:
Subtract the ones:

By subtracting 6 from 7 we get 1.
Subtract the tens:

By subtracting 1 from 1 we get 0.
Subtract the hundreds:

By subtracting 6 from 8 we get 2.
Subtract the thousands:

By subtracting 7 from 13 we get 6.

c.

Subtract 130 from 1215 then you get 1085.

Explanation:
Subtract the ones:

By subtracting 0 from 5 we get 5.
Subtract the tens:

By subtracting 3 from 1 is not possible. So take borrow from the hundreds.
Subtract the hundreds:

By subtracting 1 from 1 we get 0.
Subtract the thousands:

By subtracting 0 from 1 we get 1.

d.

Subtract 19782 from 36973.

Explanation:
Subtract the ones:

By subtracting 2 from 3 we get 1.
Subtract the tens:

By subtracting 8 from 7 is not possible. So take borrow from the hundreds place.
Subtract the hundreds:

By subtracting 7 from 8 we get 1.
Subtract the thousands:

By subtracting 9 from is not possible. So take borrow from the ten thousands place.
Subtract the ten thousands:

By subtracting 1 from 2 we get 1.

e.

Subtract 6327 from 7113 then you get 876.

Explanation:
Subtract the ones:

By subtracting 7 from 3 is not possible. So take borrow from the tens place.
Subtract the tens:

By subtracting 2 from 0 is not possible. So take borrow from the hundreds place.
Subtract the hundreds:

By subtracting 3 from is not possible. So take borrow from the thousands place.
Subtract the thousands:

By subtracting 6 from 6 we get 0.

Question 6.
a.

Subtract 7983 from 79342 then you get 71359.

Explanation:
Subtract the ones:

By subtracting 3 from 2 is not possible. So take borrow from the tens place.
Subtract the tens:

By subtracting 8 from 3 is not possible. So take borrow from the hundreds place.
Subtract the hundreds:

By subtracting 9 from 2 is not possible. So take borrow from the thousands.
Subtract the thousands:

By subtracting 7 from 8 we get 1.
Subtract the ten thousands:

By subtracting 0 from 7 we get 7.

b.

Subtract 24712 from 44500 then you get 19888.

Explanation:
Subtract the ones:

By subtracting 2 from 0 is not possible. So take borrow from the tens.
Subtract the tens:

By subtracting 9 from 1 we get 8.
Subtract the hundreds:

By subtracting 7 from 5 is not possible. So take borrow from the thousands place.
Subtract the thousands:

By subtracting 4 from 3 is not possible. so take borrow from the ten thousands.
Subtract the ten thousands:

By subtracting 2 from 3 we get 1.

c.

Subtract 4372 from 6137 then you get 1755.

Explanation:
Subtract the ones:

By subtracting 2 from 7 we get 5.
Subtract the tens:

By subtracting 7 from 3 is not possible. So take borrow from the hundreds place.
Subtract the hundreds:

By subtracting 3 from 0 is not possible. So take borrow from the thousands place.
Subtract the thousands:

By subtracting 4 from 5 we get 1.

d.

Subtract 50913 from 60704 then you get 9791.

Explanation:
Subtract the ones:

By subtracting 3 from 4 we get 1.
Subtract the tens:

By subtracting 1 from 9 we get 8.
Subtract the hundreds:

By subtracting 9 from 7 is not possible. So take the borrow from the thousands.
Subtract the thousands:

By subtracting 0 from 9 we get 9.
Subtract the ten thousands:

By subtracting 5 from 5 we get 0.

e.

Subtract 7512 from 9702 then you get 2190.

Explanation:
Subtract the ones:

By subtracting 2 from 2 we get 0.
Subtract the tens:

By subtracting 1 from 0 is not possible. So take borrow from the hundreds place.
Subtract the hundreds:

By subtracting 5 from 6 we get 1.
Subtract the thousands:

By subtracting 7 from 9 we get 2.

Question 7.
a.

Subtract 370 from 8791 then you get 8421.

Explanation:
Subtract the ones:

By subtracting 0 from 1 we get 1.
Subtract the tens:

By subtracting 7 from 9 we get 2.
Subtract the hundreds:

By subtracting 3 from 7 we get 4.
Subtract the thousands:

By subtracting 0 from 8 we get 8

b.

Subtract 1807 from 3487 then you get 1680.

Explanation:
Subtract the ones:

By subtracting 7 from7 we get 0.
Subtract the tens:

By subtracting 0 from 8 we get 8.
Subtract the hundreds:

By subtracting 8 from 4 is not possible. So take the borrow from the thousands place.
Subtract the thousands:

By subtracting 1 from 2 we get 1.

c.

Subtraction of 5907 from 55013 we get 49106.

Explanation:
Subtract the ones:

By subtracting 7 from 3 is not possible. So take borrow from the tens:
13 – 7 = 6.
Subtract the tens:

By subtracting 0 from 0 we get 0.
Subtract the hundreds:

By subtracting 9 from 0 is not possible. So take borrow from the thousands place.
10 – 9 = 1.
Subtract the thousands:

By subtracting 5 from 4 is not possible. so take borrow from the ten thousands place.
Subtract the ten thousands:

By subtracting 0 from 4 we get 4.

d.

Subtraction of 45797 from 47893 we get 2096.

Explanation:
Subtract the ones:
By subtracting 7 from 3 is not possible. so take borrow from the tens.
13 – 7 = 6

Subtract the tens:
By subtracting 9 from 8 is not possible. So take borrow from the hundreds.
18 – 9 = 9.

Subtract the hundreds:

Subtracting 7 from 7 we get 0.
Subtract the thousands:

By subtracting 5 from 7 we get 2.
Subtract the ten thousand:

By subtracting 4 from 4 we get 0

e.

Subtraction of 795 from 8119 we get 7324.

Explanation:
Subtract the ones:

By subtracting 5 from 9 we get 4.
Subtract the tens:

Subtract the hundreds:

By subtracting 7 from 0 is not possible. So take borrow from the thousands.
10 – 7 = 3
Subtract the thousands:

By subtracting 0 from 7 we get 7.

Question 8.
a.

Subtraction of 26174 from 84003 we get 57829.

Explanation:
Subtract the ones:

By subtracting 4 from 3 is not possible. So take borrow from the tens.
13 – 4 = 9.
Subtract the tens:

By subtracting 7 from 9 we get 2.
Subtract the hundreds:

By subtracting 1 from 9 we get 8.
Subtract the thousands:

By subtracting 6 from 4 is not possible. So take borrow from the ten thousand.
14 – 6 = 7.
Subtract the ten thousand:

By subtracting 2 from 7 we get 5.

b.

Subtraction of 9796 from 19834 we get 11838.

Explanation:
Subtract the ones:

By subtracting 6 from 4 is not possible. So take borrow from the tens.
14 – 6 = 8.
Subtract the tens:

By subtracting 9 from 2 is not possible. So take borrow from the hundreds.
12 – 9 = 3.
Subtract the hundreds:

By subtracting 7 from 7 we get 0.
Subtract the thousands:

By subtracting 9 from 9 we get 0.
Subtract the ten thousand:

By subtracting 0 from 1 we get 1.

c.

Subtract 25126 from 39137 we get 14011.

Explanation:
Subtract the ones:

By subtracting 6 from 7 we get 1.
Subtract the tens:

By subtracting 2 from 3 we get 1.
Subtract the hundreds:

By subtracting 1 from 1 we get 0.
Subtract the thousands:

By subtracting 5 from 9 we get 4.
Subtract the ten thousands:

By subtracting 2 from 3 we get 1.

d.

Subtraction of 4837 from 6655 we get 2818.

Explanation:
Subtract the ones:

By subtracting 7 from 5 is not possible. So take borrow from the tens place.
15 – 8 = 8.
Subtract the tens:

By subtracting 3 from 4 we get1.
Subtract the hundreds:

By subtracting 8 from 6 is not possible. So take borrow from the thousands.
16 – 8 = 8.
Subtract the thousands:

By subtracting 4 from 5 we get 1

e.

Subtract 957 from 7841 we get 6884.

Explanation:
Subtract the ones:

By subtracting 7 from 1 is not possible so take borrow from the tens.
11 – 7 = 4
Subtract the tens:

By subtracting 5 from 3 is not possible. So take borrow from the hundreds.
13 – 5 = 8
Subtract the hundreds.

By subtracting 9 from 7 is not possible. So take borrow from the thousands place.
17 – 9 = 8.
Subtract the thousands:

By subtracting 0 from 6 we get 6.

Question 1.
a.

Addition of 6418, 527 and 318 we get 7263.
Explanation:

By adding 1, 7 and 8 we get 23. So add 2 to the tens place.

By adding 2, 1, 2 and 1 we get 6.

By adding 4, 5 and 3 we get 12. so add 1 to the thousands place.

By adding 6 with 1 we get 7.

b.

Addition of 1385, 972 and 113 we get 2470.

Explanation:

By adding 5, 2 and 3 we get 10. So add 1 to the tens place.

By adding 1, 8, 7 and 1 we get 17. So add 1 to the hundreds place.

By adding 1, 3, 9 and 1 we get 14. So add 1 to the thousands place.

By adding 1 with 1 we get 2.

c.

Addition of 5759, 2132 and 784 we get 8675.

Explanation:

By adding 9, 2 and 4 we get 15. So add 1 to the tens place.

By adding 1, 5, 3 and 8 we get 17. So add 1 to the hundreds place.

By adding 1, 7, 1 and 7 we get 16. So add 1 to the thousands place.

By adding 1, 5 and 2 we get 8.

d.

Addition of 9107, 6048 and 710 we get 15865.

Explanation:

By adding 7, 8 and 0 we get 15. So add 1 to the tens place.

By adding 1, 0, 4 and 1 we get 6.

By adding 1, 0 and 7 we get 8.

By adding 9 with 6 we get 15.

e.

Addition of 1248, 1212 and 1047 we get 3507.

Explanation:

By adding 8, 2 and 7 we get 17. So add 1 to the tens place.

By adding 1, 4, 1 and 4 we get 10. So add 1 to the hundreds place.

By adding 1, 2, 2 and 0 we get 5.

By adding 1, 1 and 1 we get 3.

Question 2.
a.

Addition of 998 with 795 we get 1793.

Explanation:

By adding 8 with 5 we get 13. So add 1 to the tens place.

By adding 1, 9 and 9 we get 19. So add 1 to the hundreds place.

By adding 1, 9 and 7 we get 17.

b.

Addition of 10007 with 9323 we get 19330

Explanation:

By adding 7 with 3 we get 13. so add 1 to the tens place.

By adding 1, 0 and 2 we get 3.

By adding 0 with 3 we get 3.

By adding 0 with 9 we get 9.

By adding 1 with 0 we get 1.

c.

Addition of 72457 with 38718 we get 1,11,175.

Explanation:

By adding 7 with 8 we get 15. So add 1 to the tens place.

By adding 1, 5 and 1 we get 7.

By adding 4 with 7 we get 11. So add 1 to the thousands place.

By adding 1, 2 and 8 we get 11. So add 1 to the ten thousands place.

By adding 1, 7 and 3 we get 11.

d.

Addition of 6514 with 3572 we get 9086.

Explanation:

By adding 4 with 2 we get 6.

By adding 1 with 7 we get 8.

By adding 5 with 5 we get 10. So add 1 to the thousands place.

By adding 1, 6 and 3 we get 9.

e.

Addition of 105 with 103 we get 207.

Explanation:

By adding 5 with 3 we get 8.

By adding 0 with 0 we get 0.

By adding 1 with 1 we get 2.

Subtract.

Question 3.
a.

Subtraction of 4092 from 8080 we get 3988.

Explanation:
Subtract the ones:

By subtracting 2 from 0 is not possible. So take borrow from the tens place.
10 – 2 = 8.
Subtract the tens:

By subtracting 9 from 7 is not possible. So take borrow from the hundreds place.
17 – 9 = 8.
Subtract the hundreds:

By subtracting 0 from 9 we get 9.
Subtract the thousands:

By subtracting 4 from 7 we get 3.

b.

Subtraction of 37948 from 79998 we get 32050.

Explanation:
Subtract the ones:

By subtracting 8 from8 we get 0.
Subtract the tens:

By Subtracting 4 from 9 we get 5.
Subtract the hundreds:

By subtracting 9 from 9 we get 0.
Subtract the thousands:

By subtracting 7 from 9 we get 2.
Subtract the ten thousands:

By adding 3 from 7 we get 4.

c.

Subtraction of 9007 from 47973 we get 38966.

Explanation:
Subtract the ones:

Subtraction of 7 from 3 is not possible. So take borrow from the tens.
13 – 7 = 6.
Subtract the tens:

By subtracting 0 from 6 we get 6.
Subtract the hundreds:

By subtracting 0 from 9 we get 9.
Subtract the thousands:

Subtract 9 from 7 is not possible. So take borrow from the ten thousands.
17 – 9 = 8.
Subtract the ten thousand:

By subtracting 0 from 3 we get 3.

d.

Subtraction of 6912 from 7013 we get 0101.

Explanation:
Subtract the ones:

By subtracting 2 from 3 we get 1.
Subtract the tens:

By subtracting 1 from 1 we get 0.
Subtract the hundreds:

By subtracting 9 from 0 is not possible. So take borrow from the thousands.
10 – 9 = 1.
Subtract the thousands:

By subtracting 6 from 6 we get 0

e.

Subtraction of 7289 from 8173 we get 884.

Explanation:
Subtract the ones:

By subtracting 9 from3 is not possible. So take borrow from the tens place.
13 – 9 = 4.
Subtract the tens:

By subtracting 8 from 6 is not possible. So take borrow rom the hundreds place.
16 – 8 = 8.
Subtract the hundreds:

By subtracting 2 from 0 is not possible. So take borrow from the thousands place.
10 – 2 = 8.
Subtract the thousands:

By subtracting 7 from 7 we get 0.

Question 4.
a.

Subtraction of 12092 from 18873 we get 6781.

Explanation:
Subtract the ones:

By subtracting 2 from 3 we get 1.
Subtract the tens:

By subtracting 9 from 7 is not possible. So take borrow from the hundreds place.
Subtract the hundreds:

By subtracting 0 from 7 we get 7.
Subtract the thousands:

By subtracting 2 from 8 we get 6.
Subtract the ten thousand:

By subtracting 1 from 1 get 0.

b.

Subtraction of 2076 from 51135 we get 49059.

Explanation:
Subtract the ones:

By subtracting 6 from 5 is not possible. So take borrow from the tens.
15 – 6 = 9
Subtract the tens:

By subtracting 7 from 2 is not possible. So take borrow from the hundreds.
12 – 7 = 5.
Subtract the hundreds:

By subtracting 0 from 0 we get 0.
Subtract the thousands:

By subtracting 2 from 1 is not possible. So take borrow from the ten thousands.
11 – 2 = 9.
Subtract the ten thousands:

By subtracting 0 from 4 we get 4.

c.

Subtraction of 4108 from 5117 we get 1009.

Explanation:
Subtract the ones:

By subtracting 8 from 7 is not possible. So take the borrow from the tens place.
17 – 8 = 9.
Subtract the tens:

By subtracting 0 from 0 we get 0.
Subtract the hundreds:

By subtracting 1 from 1 we get 0.
Subtract the thousands:

By subtracting 4 from 5 we get 1.

d.

Subtraction of 945 from 1195 we get 250.

Explanation:
Subtract the ones:

By subtracting 5 from 5 we get 0.
Subtract the tens:

By subtracting 4 from 9 we get 5.
Subtract the hundreds:

By subtracting 9 from 1 is not possible. So take the borrow from the thousands.
11 – 9 = 2.

e.

Subtraction of 6816 from 7495 we get 779.

Explanation:
Subtract the ones:

By subtracting 6 from5 is not possible. So take borrow from the tens place.
15 – 6 = 9.
Subtract the tens:

By subtracting 1 from 8 we get 7.
Subtract the hundreds:

By subtracting 8 from 4 is not possible. So take borrow from the thousands.
14 – 8 = 7.
Subtract the thousands:

By subtracting 6 from 6 we get 0.

Question 5.
a.

Addition of 4405 with 758 we get 5163.

Explanation:

By adding 5 with 8 we get 13. So add 1 to the tens place

By adding 1, 0 and 5 we get 6.

By adding 4 with 7 we get 11. So add 1 to the thousands place.

By adding 1 with 4 we get 5.

b.

Subtract 8675 from 66481 we get 57806.

Explanation:
Subtract the ones:

By subtracting 5 from 1 is not possible. So take the borrow from the tens.
11 – 5 = 6.
Subtract the tens:

By subtracting 7 from 7 we get 0.
Subtract the hundreds:

By subtracting 6 from 4 is not possible. So take borrow from the thousands place.
14 – 6 = 8
Subtract the thousands:

By subtracting 8 from 5 is not possible. So take borrow from the ten thousands.
15 – 8 = 7.
Subtract the ten thousand:

By subtracting 0 from 5 we get 5.

c.

Subtract 3216 from 4007 we get

Explanation:
Subtract the ones:

By subtracting 6 from 7 we get 1.
Subtract the tens:

By subtracting 1 from 0 is not possible. So take the borrow from the hundreds.
10 – 1 = 9.
Subtract the hundreds:

By subtracting 2 from 9 we get 7.
Subtract the thousands:

By subtracting 3 from 3 we get 0.

d.

Addition of 12489 with 7981 we get 20470.

Explanation:

By adding 9 with 1 we get 10. So add 1 to the tens place.

By adding 1, 8 and 8 we get 17. So add 1 to the hundreds place.

By adding 1, 4 and 9 we get 14. So add 1 to the thousands place.

By adding 1, 2 and 7 we get 10. So add 1 to the ten thousands place.

By adding 1 with 1 we get 2.

e.

Subtract 250 from 2817 we get 2567.

Explanation:
Subtract the ones:

By subtracting 0 from 7 we get 7.
Subtract the tens:

Subtracting 5 from 1 is not possible. So take borrow from hundreds place.
Subtract the hundreds:

By subtracting 2 from 7 we get 5.
Subtract the thousands:

By subtracting 0 from 2 we get 2.

Question 6.
a.

Addition of 341 with 298 we get 639.

Explanation:

By adding 1 with 8 we get 9.

By adding 4 with 9 we get 11. So add 1 to the hundreds place.

By adding 1, 3 and 2 we get 6.

b.

Addition of 17116 with 8713 we get 25829.

Explanation:

By adding 6 with 3 we get 9.

By adding 1 with 1 we get 2.

By adding 1 with 7 we get 8.

By adding 7 with 8 we get 15. So add 1 to the ten thousands place.

By adding 1 with 1 we get 2.

c.

Subtraction of 85762 from 97581 we get 11819.

Explanation:
Subtract the ones:

By subtracting 2 from 1 is not possible. So take borrow from the tens.
Subtract the tens:

By subtracting 6 from 7 we get 1.
Subtract the hundreds:

By subtracting 7 from 5 is not possible. so take borrow from the thousands place.
15 – 7 = 8.
Subtract the thousands:

By subtracting 5 from 6 we get 1.
Subtract the ten thousands:

By subtracting 8 from 9 we get 1.

d.

Addition of 6245 with 5345 we get 11590.

Explanation:

By adding 5 with 5 we get 10. So add 1 to the tens place.

By adding 1, 4 and 4 we get 9.

By adding 2 with 3 we get 5.

By adding 6 with 5 we get 11.

e.

Subtract 7335 from 15035 we get 8700.

Explanation:
Subtract the ones:

By subtracting 5 from 5 we get 0.
Subtract the tens:

By subtracting 3 from 3 we get 0.
Subtract the hundreds:

By subtracting 3 from 0 is not possible. So take borrow from the thousands place.
Subtract the thousands:

By subtracting 7 from 4 is not possible. So take borrow from the ten thousands place.
Subtract the ten thousand:

By subtracting 0 from 0 we get 0

Question 7.
a.

Subtraction of 12734 from 14809 we get 27543.

Explanation:
Subtract the ones:

By subtracting 4 from 9 we get 5.
Subtract the tens:

By subtracting 3 from 0 is not possible. So take borrow from the hundreds.
Subtract the hundreds:

By subtracting 7 from 7 we get 0.
Subtract the thousands:

By subtracting 2 from 4 we get 2.
Subtract the ten thousands:

By subtracting 1 from 1 we get 0.

b.

Addition of 28785 with 13816 we get 42601.

Explanation:

By adding 5 with 6 we get 11. So add 1 to the tens place.

By adding 1, 8 and 1 we get 10. So add 1 to the hundreds place.

By adding 1, 7 and 8 we get 16. so add 1 to the thousands place.

By adding 1, 8 and 3 we get 12. So add 1 to the ten thousands place.

By adding 1, 2 and 1 we ger 4.

c.

Subtract 4517 from 9248 we get 4731.

Explanation:
Subtract the ones:

By subtracting 7 from 8 we get 1.
Subtract the tens:

By subtracting 1 from 4 we get 3.
Subtract the hundreds:

By subtracting 5 from 2 is not possible. So take borrow from the thousands.
Subtract the thousands:

By subtracting 4 from 8 we get 4.

d.

Addition of 5217 with 5172 we get 10389.

Explanation:

By adding 7 with 2 we get 9.

By adding 1 with 7 we get 8.

By adding 2 with 1 we get 3.

By adding 5 with 5 we get 10.

e.

Subtract 8862 from 92408 we get 83546.

Explanation:
Subtract the ones:

By subtracting 2 from8 we get 6.
Subtract the tens:

By subtracting 6 from 0 is not possible. So take borrow from the hundreds.
Subtract the hundreds:

By subtracting 8 from is not possible. So take borrow from the thousands place.
Subtract the thousands:

By subtracting 8 from 1 is not possible. So take borrow from the ten thousands place.
Subtract the ten thousand:

By subtracting o from 8 we get 8.

Question 8.
a.

Addition of 4500. 3217 and 2518 we get 10235.

Explanation:

By adding 0, 7 and 8 we get 15. So add 1 to the tens place.

By adding 1, 0, 1 and 1 we get 3.

By adding 5, 2 and 5 we get 12. So add 1 to the thousands place.

By adding 1, 4, 3 and 2 we get 10.

b.

c.

Addition of 5218, 735 and 613 we get 6566.

Explanation:

By adding 8, 5 and 3 we get 16. So add 1 to the tens place.

By adding 1, 1, 3 and 1 we get 6.

By adding 2, 7 and 6 we get 15. So add 1 to the thousands place.

By adding 1 with 5 we get 6.

d.

Addition of 6208 with 1517 we get 7725.

Explanation:

By adding 8 with 7 we get 15. So add 1 to the tens place.

By adding 1, 0 and 1 we get 2.

By adding 2 with 5 we get 7.

By adding 6 with 1 we get 7.

e.

Addition of 7185, 5807 and 914 we get 13906.

Explanation: