This handy Spectrum Math Grade 4 Answer Key Chapter 2 Lesson 2.3 Rounding provides detailed answers for the workbook questions.
Spectrum Math Grade 4 Chapter 2 Lesson 2.3 Rounding Answers Key
Rounding
Round 783,538 to the nearest ten thousand.
Look at the thousands digit. 15,897
8 is greater than or equal to 5, so round 5 to 6 in the thousands place. Follow with zeros.
16,000
Round 234,034 to the nearest hundred. Look at the tens digit. 234,034
3 is less than 5, so 0 stays in the hundreds place. Follow with zeros.
234,000
Round to the nearest ten.
Question 1.
a. 6,421
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Answer:
Given that the number is 6,421.
Here 1 is in ones place and 2 in tens place.
1 is less than 5. so, replace 1 with 0.
Therefore 6,421 rounded to the nearest ten is 6,420.
b. 5,882
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Answer:
Given that the number is 5,882.
Here 2 is in ones place and 8 in tens place.
2 is less than 5. so, replace 2 with 0.
Therefore 5,882 rounded to the nearest ten is 5,880.
c. 45,288
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Answer:
Given that the number is 45,288.
Here 8 is in ones place and 8 in tens place.
8 is greater than 5. so, replace 1 with 0 and add 1 to the tens place.
Therefore 45,288 rounded to the nearest ten is 45,288.
d. 975
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Answer:
Given that the number is 975.
Here 5 is in ones place and 7 in tens place.
5 is greater than or equal to 5. so, replace 5 with 0 and add 1 to the tens place.
Therefore 975 rounded to the nearest ten is 980.
e. 13,936
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Answer:
Given that the number is 13,936.
Here 6 is in ones place and 3 in tens place.
6 is greater than 5. so, replace 6 with 0 and add 1 to the tens place.
Therefore 13,936 rounded to the nearest ten is 13,936.
f. 842
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Answer:
Given that the number is 842.
Here 2 is in ones place and 4 in tens place.
2 is less than 5. so, replace 2 with 0.
Therefore 842 rounded to the nearest ten is 840.
Question 2.
a. 9,855
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Answer:
Given that the number is 9,855.
Here 5 is in ones place and 5 in tens place.
5 is greater than or equal to 5. so, replace 5 with 0 and 1 to the tens place.
Therefore 9,855 rounded to the nearest ten is 9,860.
b. 26,917
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Answer:
Given that the number is 26,917.
Here 7 is in ones place and 1 in tens place.
7 is greater than 5. so, replace 7 with 0 and add 1 to the tens place.
Therefore 26.917 rounded to the nearest ten is 26,917.
c. 984
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Answer:
Given that the number is 984.
Here 4 is in ones place and 8 in tens place.
4 is less than 5. so, replace 4 with 0.
Therefore 984 rounded to the nearest ten is 980.
d. 95,645
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Answer:
Given that the number is 95,645.
Here 5 is in ones place and 4 in tens place.
5 is greater than or equal to 5. so, replace 5 with 0 and add 1 to the tens place.
Therefore 95,645 rounded to the nearest ten is 95,650.
e. 8,673
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Answer:
Given that the number is 8,673.
Here 3 is in ones place and 7 in tens place.
3 is less than 5. so, replace 3 with 0.
Therefore 8,673 rounded to the nearest ten is 8,670.
f. 29,981
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Answer:
Given that the number is 29,981.
Here 1 is in ones place and 8 in tens place.
1 is less than 5. so, replace 1 with 0.
Therefore 29,981 rounded to the nearest ten is 29,980.
Round to the nearest hundred.
Question 3.
a. 325, 793
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Answer:
Given that the number is 325,793.
Here 9 in tens place and 7 in hundreds place.
90 is greater than 50. So replace 0 in ones and tens place, add 1 to the hundreds place.
Therefore 325,793 rounded to the nearest hundred is 325,700.
b. 49,832
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Answer:
Given that the number is 49,832.
Here 3 in tens place and 8 in hundreds place.
80 is greater than 50. So replace 0 in ones and tens place, add 1 to the hundreds place.
Therefore 49,832 rounded to the nearest hundred is 49,800.
c. 123,652
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Answer:
Given that the number is 123,652.
Here 5 in tens place and 6 in hundreds place.
00 is greater than or equal to 50. So replace 0 in ones and tens place, 1 to the hundreds place.
Therefore 123,652 rounded to the nearest hundred is 123,600.
d. 24,635
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Answer:
Given that the number is 24,635.
Here 3 in tens place and 6 in hundreds place.
30 is less than 50. So replace 0 in ones and tens place.
Therefore 24,635 rounded to the nearest hundred is 24,600.
e. 199,794
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Answer:
Given that the number is 199,794.
Here 9 in tens place and 7 in hundreds place.
90 is greater than 50. So replace 0 in ones and tens place, 1 to the hundreds place.
Therefore 199,794 rounded to the nearest hundred is 199,794.
f. 79,342
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Answer:
Given that the number is 79,342.
Here 4 in tens place and 3 in hundreds place.
40 is less than 50. So replace 0 in ones and tens place.
Therefore 79,342 rounded to the nearest hundred is 79,300.
Question 4.
a.
798,759
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Answer:
Given that the number is 798,759.
Here 5 in tens place and 7 in hundreds place.
50 is greater than or equal to 50. So replace 0 in ones and tens place, 1 to the hundreds place.
Therefore 798,759 rounded to the nearest hundred is 798,700.
b. 58,345
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Answer:
Given that the number is 58,345.
Here 4 in tens place and 3 in hundreds place.
40 is less than 50. So replace 0 in ones and tens place.
Therefore 58,345 rounded to the nearest hundred is 58,300.
c. 9,873
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Answer:
Given that the number is 9,873.
Here 7 in tens place and 8 in hundreds place.
70 is greater than 50. So replace 0 in ones and tens place.
Therefore 9,873 rounded to the nearest hundred is 9,800.
d. 8,375
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Answer:
Given that the number is 8,375.
Here 7 in tens place and 3 in hundreds place.
70 is greater than 50. So replace 0 in ones and tens place, 1 to the hundreds place.
Therefore 8,375 rounded to the nearest hundred is 8,300.
e. 10,097
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Answer:
Given that the number is 10,097.
Here 9 in tens place and 0 in hundreds place.
90 is greater than 50. So replace 0 in ones and tens place, 1 to the hundreds place.
Therefore 10,097 rounded to the nearest hundred is 10,000.
f. 1,987,654
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Answer:
Given that the number is 1,987,654.
Here 5 in tens place and 6 in hundreds place.
50 is greater than or equal to 50. So replace 0 in ones and tens place, 1 to the hundreds place.
Therefore 1,987,654 rounded to the nearest hundred is 1,987,600.
Round to the nearest thousand.
Question 6.
a. 567,523
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Answer:
Given that the number is 567,523.
Here 5 is in hundreds place and 7 in thousands place.
500 is greater than or equal to 500. So, replace 0 in ones, tens and hundreds place and add 1 to the thousands place.
Therefore 567,523 rounded to the nearest thousand is 567,000.
b. 93,567
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Answer:
Given that the number is 93,567.
Here 5 is in hundreds place and 3 in thousands place.
500 is greater than or equal to 500. So, replace 0 in ones, tens and hundreds place and add 1 to the thousands place.
Therefore 93,567 rounded to the nearest thousand is 93,000.
c. 4,378
________
Answer:
Given that the number is 4,378.
Here 3 is in hundreds place and 4 in thousands place.
300 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 4,378 rounded to the nearest thousand is 4,000.
d. 12,499
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Answer:
Given that the number is 12,499.
Here 4 is in hundreds place and 2 in thousands place.
400 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 12,499 rounded to the nearest thousand is 12,000.
e. 747,399
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Answer:
Given that the number is 747,399.
Here 3 is in hundreds place and 7 in thousands place.
300 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 747,399 rounded to the nearest thousand is 747,000.
f. 9,385
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Answer:
Given that the number is 9,385.
Here 3 is in hundreds place and 9 in thousands place.
300 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 9,385 rounded to the nearest thousand is 9,000.
Question 6.
a. 987,436
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Answer:
Given that the number is 987,436.
Here 4 is in hundreds place and 7 in thousands place.
400 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 987,436 rounded to the nearest thousand is 987,000.
b. 346,345
________
Answer:
Given that the number is 346,345.
Here 3 is in hundreds place and 6 in thousands place.
300 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 346,345 rounded to the nearest thousand is 346,000.
c. 98,345
________
Answer:
Given that the number is 98,345.
Here 3 is in hundreds place and 8 in thousands place.
300 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 98,345 rounded to the nearest thousand is 98,000.
d. 8,564
________
Answer:
Given that the number is 8,564.
Here 5 is in hundreds place and 8 in thousands place.
500 is greater than or equal to 500. So, replace 0 in ones, tens and hundreds place and add 1 to the thousands place.
Therefore 8,564 rounded to the nearest thousand is 8,000.
e. 75,459
________
Answer:
Given that the number is 75,459.
Here 4 is in hundreds place and 5 in thousands place.
400 less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 75,459 rounded to the nearest thousand is 75,000.
f. 187,349
________
Answer:
Given that the number is 187,349.
Here 3 is in hundreds place and 7 in thousands place.
300 is less than 500. So, replace 0 in ones, tens and hundreds place.
Therefore 187,349 rounded to the nearest thousand is 187,000.