# Spectrum Math Grade 4 Chapter 1 Lesson 3 Answer Key Adding Three or More Numbers (Single Digit)

This handy Spectrum Math Grade 4 Answer Key Chapter 1 Lesson 1.3 Adding Three or More Numbers (Single Digit) provides detailed answers for the workbook questions.

## Spectrum Math Grade 4 Chapter 1 Lesson 1.3 Adding Three or More Numbers (Single Digit) Answers Key  Question 1.
a.  Explanation:
Adding the first two digits of ones, 3 and 4 gives 7
Then adding 7 to the third digit 5 of ones, gives 12
So, the sum of addends 3 , 4 and 5 is 12
3 + 4 = 7 + 5 = 12

b.  Explanation:
Adding the first two digits of ones, 2 and 6 gives 8
Then adding 8 to the third digit 3 of ones, gives 11
So, the sum of addends 2, 6 and 3 is 11
2 + 6 = 8 + 3 = 11

c.  Explanation:
Adding the first two digits of ones, 7 and 5 gives 12
Then adding 12 to the third digit 3 of ones, gives 15
So, the sum of addends 7 , 5 and 3 is 15
7 + 5 = 12 + 3 = 15

d.  Explanation:
Adding the first two digits of ones, 6 and 3 gives 9
Then adding 9 to the third digit 7 of ones, gives 16
So, the sum of addends 6, 3 and 7 is 16
6 + 3 = 9 + 7 = 16

e.  Explanation:
Adding the first two digits of ones, 8 and 7 gives 15
Then adding 15 to the third digit 2 of ones, gives 17
So, the sum of addends 8, 7 and 2 is 17
8 + 7 = 15 + 2 = 17

f.  Explanation:
Adding the first two digits of ones, 9 and 8 gives 17
Then adding 17 to the third digit 1 of ones, gives 18
So, the sum of addends 9, 8 and 1 is 18
9 + 8 = 17 + 1 = 18

g.  Explanation:
Adding the first two digits of ones, 3 and 6 gives 9
Then adding 9 to the third digit 8 of ones, gives 17
So, the sum of addends 3, 6 and 8 is 17
3 + 6 = 9 + 8 = 17

h.  Explanation:
Adding the first two digits of ones, 1 and 7 gives 8
Then adding 8 to the third digit 6 of ones, gives 14
So, the sum of addends 1, 7 and 6 is 14
1 + 7 = 8 + 6 = 14

Question 2.
a.  Explanation:
Adding the first two digits of ones, 4 and 6 gives 10
Then adding 10 to the third digit 8 of ones, gives 18
So, the sum of addends 4, 6 and 8 is 18
4 + 6 = 10 + 8 = 18

b.  Explanation:
Adding the first two digits of ones, 3 and 5 gives 8
Then adding 8 to the third digit 2 of ones, gives 10
So, the sum of addends 3, 5 and 2 is 10
3 + 5 = 8 + 2 = 10

c.  Explanation:
Adding the first two digits of ones, 1 and 5 gives 6
Then adding 6 to the third digit 7 of ones, gives 13
So, the sum of addends 1, 5 and 7 is 13
1+ 5 = 6 + 7 = 13

d.  Explanation:
Adding the first two digits of ones, 8 and 5 gives 13
Then adding 13 to the third digit 3 of ones, gives 16
So, the sum of addends 8, 5 and 3 is 16
8 + 5 = 13 + 3 = 16

e.  Explanation:
Adding the first two digits of ones, 4 and 7 gives 11
Then adding 11 to the third digit 8 of ones, gives 19
So, the sum of addends 4, 7 and 8 is 19
4 + 7 = 11 + 8 = 19

f.  Explanation:
Adding the first two digits of ones, 3 and 8 gives 11
Then adding 11 to the third digit 9 of ones, gives 20
So, the sum of addends 3, 8 and 9 is 20
3 + 8 = 11 + 9 = 20

g.  Explanation:
Adding the first two digits of ones, 2 and 6 gives 8
Then adding 8 to the third digit 9 of ones, gives 17
So, the sum of addends 2, 6 and 9 is 17
2 + 6 = 8 + 9 = 17

h.  Explanation:
Adding the first two digits of ones, 3 and 3 gives 6
Then adding 6 to the third digit 7 of ones, gives 13
So, the sum of addends 3, 3 and 7 is 13
3 + 3 = 6 + 7 = 13

Question 3.
a.  Explanation:
Adding the first two digits of ones, 8 and 7 gives 15
Then adding 15 to the third digit 5 of ones, gives 20
So, the sum of addends 8, 7 and 5 is 20
8 + 7 = 15 + 5 = 20

b.  Explanation:
Adding the first two digits of ones, 8 and 3 gives 11
Then adding 11 to the third digit 5 of ones, gives 16
So, the sum of addends 8, 6 and 5 is 16
8 + 3 = 11 + 5 = 16

c.  Explanation:
Adding the first two digits of ones, 3 and 8 gives 11
Then adding 11 to the third digit 2 of ones, gives 13
So, the sum of addends 3, 8 and 2 is 13
3 + 8 = 11 + 2 = 13

d.  Explanation:
Adding the first two digits of ones, 2 and 8 gives 10
Then adding 10 to the third digit 6 of ones, gives 16
So, the sum of addends 2, 8 and 6 is 16
2 + 8 = 10 + 6 = 16

e.  Explanation:
Adding the first two digits of ones, 6 and 7 gives 13
Then adding 13 to the third digit 8 of ones, gives 21
So, the sum of addends 6, 7 and 8 is 21
6 + 7 = 13 + 8 = 21

f.  Explanation:
Adding the first two digits of ones, 3 and 6 gives 9
Then adding 9 to the third digit 9 of ones, gives 18
So, the sum of addends 3, 6 and 9 is 18
3 + 6 = 9 + 9 = 18

g.  Explanation:
Adding the first two digits of ones, 1 and 8 gives 9
Then adding 9 to the third digit 7 of ones, gives 16
So, the sum of addends 1, 8 and 7 is 16
1 + 8 = 9 + 7 = 16

h.  Explanation:
Adding the first two digits of ones, 5 and 7 gives 12
Then adding 12 to the third digit 9 of ones, gives 21
So, the sum of addends 5 , 7 and 9 is 21
5 + 7 = 12 + 9 = 21

Question 4.
a.  Explanation:
Adding the first two digits of ones, 1 and 3 gives 4
Then adding 4 to the third digit 5 of ones, gives 9
Then adding 9 to the fourth digit 7 of ones, gives 16
So, the sum of addends 1, 3, 5 and 7  is 16
1 + 3= 4 + 5 = 9 + 7 = 16

b.  Explanation:
Adding the first two digits of ones, 2 and 6 gives 8
Then adding 8 to the third digit 7 of ones, gives 15
Then adding 15 to the fourth digit 4 of ones, gives 19
So, the sum of addends 2, 6, 7 and 4  is 19
2 + 6 = 8 + 7 = 15 + 4 = 19

c.  Explanation:
Adding the first two digits of ones, 1 and 5 gives 6
Then adding 6 to the third digit 9 of ones, gives 15
Then adding 15 to the fourth digit 7 of ones, gives 22
So, the sum of addends 1, 5, 9 and 7  is 22
1 + 5 = 6 + 9 = 15 + 7 = 22

d.  Explanation:
Adding the first two digits of ones, 3 and 5 gives 8
Then adding 8 to the third digit 4 of ones, gives 12
Then adding 12 to the fourth digit 6 of ones, gives 18
So, the sum of addends 3, 5, 4 and 6  is 18
3 + 5 = 8 + 4 =12+ 6 = 18

e.  Explanation:
Adding the first two digits of ones, 2 and 2 gives 4
Then adding 4 to the third digit 2 of ones, gives 6
Then adding 6 to the fourth digit 8 of ones, gives 14
So, the sum of addends 2, 2 , 2 and 8  is 14
2 + 2 = 4 + 2 = 6 + 8 = 14

f.  Explanation:
Adding the first two digits of ones, 1 and 7 gives 8
Then adding 8 to the third digit 8 of ones, gives 16
Then adding 16 to the fourth digit 9 of ones, gives 25
So, the sum of addends 1, 7,  8 and 9  is 25
1 + 7 = 8 + 8 = 16 + 9 = 25

g.  Explanation:
Adding the first two digits of ones, 4 and 4 gives 8
Then adding 8 to the third digit 5 of ones, gives 13
Then adding 13 to the fourth digit 6 of ones, gives 19
So, the sum of addends 4, 4 , 5 and 6  is 19
4 + 4 = 8 + 5 = 13 + 6 = 19

h.  Explanation:
Adding the first two digits of ones, 3 and 4 gives 7
Then adding 7 to the third digit 6 of ones, gives 13
Then adding 13 to the fourth digit 8 of ones, gives 21
So, the sum of addends 3, 4 , 6 and 8  is 21
3 + 4 = 7 + 6 = 13 + 8 = 21

Question 5.
a.  Explanation:
Adding the first two digits of ones, 2 and 6 gives 8
Then adding 8 to the third digit 4 of ones, gives 12
Then adding 12 to the fourth digit 8 of ones, gives 20
So, the sum of addends 2, 6, 4 and 8  is 20
2 + 4 = 8 + 4 = 12 + 8 = 20

b.  Explanation:
Adding the first two digits of ones, 2 and 2 gives 4
Then adding 4 to the third digit 8 of ones, gives 12
Then adding 12 to the fourth digit 7 of ones, gives 19
So, the sum of addends 2, 2 ,8 and 7  is 19
2 + 2 = 4 + 8 = 12 + 7 = 19

c.  Explanation:
Adding the first two digits of ones, 4 and 5 gives 9
Then adding 9 to the third digit 7 of ones, gives 16
Then adding 16 to the fourth digit 9 of ones, gives 25
So, the sum of addends 4, 5, 7 and 9  is 25
4 + 5 = 9 + 7 = 16 + 9 = 25

d.  Explanation:
Adding the first two digits of ones, 3 and 3 gives 6
Then adding 6 to the third digit 4 of ones, gives 10
Then adding 10 to the fourth digit 4 of ones, gives 14
So, the sum of addends 3, 3 , 4 and 4  is 14
3 + 3 = 6 + 4 = 10 + 4 = 14

e.  Explanation:
Adding the first two digits of ones, 5 and 5 gives 10
Then adding 10 to the third digit 4 of ones, gives 14
Then adding 14 to the fourth digit 3 of ones, gives 17
So, the sum of addends 5, 5 , 4 and 3  is 17
5 + 5 = 10 + 4 = 14 + 3 = 17

f.  Explanation:
Adding the first two digits of ones, 6 and 3 gives 9
Then adding 9 to the third digit 7 of ones, gives 16
Then adding 16 to the fourth digit 1 of ones, gives 17
So, the sum of addends 6, 3 , 7 and 1  is 17
6 + 3 = 9 + 7 = 16 + 1 = 17

g.  Explanation:
Adding the first two digits of ones, 5 and 4 gives 9
Then adding 9 to the third digit 8 of ones, gives 17
Then adding 17 to the fourth digit 9 of ones, gives 26
So, the sum of addends 5, 4 , 8 and 9  is 26
5 + 4 = 9 + 8 = 17 + 9 = 26

h.  Explanation:
Adding the first two digits of ones, 1 and 7 gives 8
Then adding 8 to the third digit 1 of ones, gives 9
Then adding 9 to the fourth digit 9 of ones, gives 18
So, the sum of addends 1, 7 ,1  and 9  is 18
1 + 7 = 8 + 1 = 9 + 9 = 18

Question 6.
a.  Explanation:
Adding the first two digits of ones, 9 and 1 gives 10
Then adding 10 to the third digit 7 of ones, gives 17
Then adding 17 to the fourth digit 2 of ones, gives 19
So, the sum of addends 9, 1 , 7 and 2  is 19
9 + 1 = 10 + 7 = 17 + 2 = 19

b.  Explanation:
Adding the first two digits of ones, 3 and 4 gives 7
Then adding 7 to the third digit 7 of ones, gives 14
Then adding 14 to the fourth digit 8 of ones, gives 22
So, the sum of addends 3 , 4, 7 and 8  is 22
3 + 4 = 7 + 7 = 14 + 8 = 22

c.  Explanation:
Adding the first two digits of ones, 2 and 5 gives 7
Then adding 7 to the third digit 7 of ones, gives 14
Then adding 14 to the fourth digit 4 of ones, gives 18
So, the sum of addends 2, 5 , 7 and 4  is 18
2 + 5 = 7 + 7 = 14 + 4 = 18

d.  Explanation:
Adding the first two digits of ones, 5 and 3 gives 8
Then adding 8 to the third digit 6 of ones, gives 14
Then adding 14 to the fourth digit 5 of ones, gives 19
So, the sum of addends 5, 3 , 6 and 5  is 19
5 + 3  = 8 + 6  =14 + 5 = 19

e.  Explanation:
Adding the first two digits of ones, 8 and 3 gives 11
Then adding 11 to the third digit 9 of ones, gives 20
Then adding 20 to the fourth digit 2 of ones, gives 22
So, the sum of addends 8, 3 , 9  and 2  is 22
8 + 3 = 11+  9= 20 + 2 = 22

f.  Explanation:
Adding the first two digits of ones, 4 and 6 gives 10
Then adding 10 to the third digit 8 of ones, gives 18
Then adding 18 to the fourth digit 3 of ones, gives 21
So, the sum of addends 4, 6 , 8 and 3  is 21
4 + 6 = 10 + 8  =18 + 3  =21

g.  Explanation:
Adding the first two digits of ones, 7 and 3 gives 10
Then adding 10 to the third digit 7 of ones, gives 17
Then adding 17 to the fourth digit 3 of ones, gives 20
So, the sum of addends 7, 3, 7 and 3  is 20
7 + 3 = 10 + 7 = 17 + 3  =20

h.  