Spectrum Math Grade 4 Chapter 1 Posttest Answer Key

This handy Spectrum Math Grade 4 Answer Key Chapter 1 Posttest provides detailed answers for the workbook questions.

Spectrum Math Grade 4 Chapter 1 Posttest Answers Key

Check What You Learned

Adding and Subtracting 1 and 2 Digits

Add or Subtract.

Question 1.
a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 1
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 1
Explanation:
Ones Place Value
3 + 7 = 10
Put the 0 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 4 + 2 = 7
Put the 7 in Tens place

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 2
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 2
Explanation:
Ones Place Value
7 + 1 = 8
Tens Place Value
5 + 2 = 7
Put the 7 in Tens place

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 3
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 3
Explanation:
Ones Place Value
7 + 5 = 12
Put the 2 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 3 + 1 = 5
Put the 5 in Tens place

d.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 4
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 4
Explanation:
Ones Place Value
3 + 8 = 11
Put the 1 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 7 + 2 = 10
Put the 0 in Tens place
Carry the 1 to Hundreds place

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 5
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 5
Explanation:
Ones Place Value
6 + 3 = 9
Put the 9 in Ones place
Tens Place Value
5 + 4 = 9
Put the 9 in Tens place
Hundreds Place Value
2 = 2
Put the 2 in Hundreds place

f.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 6
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 6
Explanation:
Ones Place Value
5 + 5 = 10
Put the 0 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 7 + 2 = 10
Put the 0 in Tens place
Carry the 1 to Hundreds place
Hundreds Place Value
1 = 1
Put the 1 in Hundreds place

Question 2.

a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 7
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 7
Explanation:
Ones Place Value
3 + 0 + 8 = 11
Put the 1 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 1 + 1 = 3
Put the 3 in Tens place

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 8
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 8
Explanation:
Ones Place Value
7 + 5 + 3 = 15
Put the 5 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 2 + 2 = 5
Put the 5 in Tens place

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 9
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 9
Explanation:
Ones Place Value
8 + 8 = 16
Put the 6 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 3 + 6 = 10
Put the 0 in Tens place
Carry the 1 to Hundreds place
Hundreds Place Value
1 + 2 = 3
Put the 3 in Hundreds place

d.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 10
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 10
Explanation:
Ones Place Value
1 + 2 + 3 = 6
Put the 6 in Ones place
Tens Place Value
9 + 8 + 7 = 24
Put the 4 in Tens place
Carry the 2 to Hundreds place
Hundreds Place Value
2 = 2
Put the 2 in Hundreds place

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 11
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 11
Explanation:
Ones Place Value
5 + 2 + 4 = 11
Put the 1 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 0 + 9 + 1 = 11
Put the 1 in Tens place
Carry the 1 to Hundreds place
Hundreds Place Value
1 + 1 = 2
Put the 2 in Hundreds place

f.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 12
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 12
Explanation:
Ones Place Value
6 + 8 = 14
Put the 4 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 5 + 4 = 10
Put the 0 in Tens place
Carry the 1 to Hundreds place

Question 3.

a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 13
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 01
Explanation:
Ones Place Value
1 + 3 = 4
Put the 4 in Ones place
Tens Place Value
2 + 1 = 3
Put the 3 in Tens place

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 14
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 14
Explanation:
Ones Place Value
3 + 2 = 5
Put the 5 in Ones place
Tens Place Value
5 + 4 = 9
Put the 9 in Tens place
Hundreds Place Value
2 = 2
Put the 2 in Hundreds place

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 15
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 15
Explanation:
Ones Place Value
7 + 8 = 15
Put the 5 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 3 + 2 = 6
Put the 6 in Tens place
Hundreds Place Value
1 = 1
Put the 1 in Hundreds place

d.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 16
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 16
Explanation:
Ones Place Value
9 + 7 = 16
Put the 6 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 7 + 9 = 17
Put the 7 in Tens place
Carry the 1 to Hundreds place

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 17
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 17
Explanation:
Ones Place Value
3 + 8 = 11
Put the 1 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 0 + 1 = 2
Put the 2 in Tens place
Hundreds Place Value
1 = 1
Put the 1 in Hundreds place

f.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 18
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 18
Explanation:
Ones Place Value
5 + 7 = 12
Put the 2 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 6 + 1 = 8
Put the 8 in Tens place

Question 4.
a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 19
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 19
Explanation:
Ones Place Value
3 + 1 + 0 = 4
Put the 4 in Ones place
Tens Place Value
7 + 2 + 1 = 10
Put the 0 in Tens place
Carry the 1 to Hundreds place
Hundreds Place Value
1 = 1
Put the 1 in Hundreds place

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 20
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 20
Explanation:
Ones Place Value
2 + 8 = 10
Put the 0 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 3 + 4 = 8
Put the 8 in Tens place
Hundreds Place Value
4 = 4
Put the 4 in Hundreds place

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 21
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 21
Explanation:
Ones Place Value
4 + 8 + 2 = 14
Put the 4 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 1 + 1 + 3 = 6
Put the 6 in Tens place

d.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 22
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 22
Explanation:
Ones Place Value
6 + 4 = 10
Put the 0 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 6 + 3 = 10
Put the 0 in Tens place
Carry the 1 to Hundreds place
Hundreds Place Value
1 = 1
Put the 1 in Hundreds place

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 23
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 23
Explanation:
Ones Place Value
4 + 5 + 7 = 16
Put the 6 in Ones place
Carry the 1 to Tens place
Tens Place Value
1 + 3 + 4 + 5 = 13
Put the 3 in Tens place
Carry the 1 to Hundreds place
Hundreds Place Value
1 = 1
Put the 1 in Hundreds place

f.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 24
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 24
Explanation:
Ones Place Value
3 + 4 = 7
Put the 7 in Ones place
Tens Place Value
1 + 7 = 8
Put the 8 in Tens place

Question 5.
a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 25
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 25
Explanation:
Subtract the ones we get 5 – 2 = 3
Subtract the tens we get 4 – 3 = 1
Subtract the hundreds we get 2 – 0 = 2
So, the difference of 245 and 32  is  213
245– 32= 213

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 26
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 26
Explanation:
6 is greater than 5 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 0, so 0 becomes 10.
Take 1 from 10, so 10 becomes 9.
Add 10 to 5, so 5 becomes 15.
15 minus 6 is 9
9 minus 1 is 8
0 minus 0 is 0

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 27
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 27
Explanation:
Subtract the ones we get 5 – 2 = 3
Subtract the tens we get 3 – 1 = 2
So, the difference of 35 and 12is  23
35 – 12 = 23

d.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 28
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 28
Explanation:
8 is greater than 2 so you must regroup:
Take 1 from 7, so 7 becomes 6.
Add 10 to 2, so 2 becomes 12.
12 minus 8 is 4
6 minus 2 is 4

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 29
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 29
Explanation:
3 is greater than 1 so you must regroup:
Take 1 from 9, so 9 becomes 8.
Add 10 to 1, so 1 becomes 11.
11 minus 3 is 8
8 minus 7 is 1

f.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 30
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 30
Explanation:
7 is greater than 5 so you must regroup:
Take 1 from 3, so 3 becomes 2.
Add 10 to 5, so 5 becomes 15.
15 minus 7 is 8
2 minus 0 is 2

Question 6.
a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 31
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 31
Explanation:
7 minus 4 is 3
3 is greater than 0 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 0, so 0 becomes 10.
10 minus 3 is 7
0 minus 0 is 0

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 32
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 32
Explanation:
5 is greater than 4 so you must regroup:
Take 1 from 9, so 9 becomes 8.
Add 10 to 4, so 4 becomes 14.
14 minus 5 is 9
8 minus 2 is 6

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 33
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 33
Explanation:
6 is greater than 5 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 5, so 5 becomes 15.
15 minus 6 is 9
2 is greater than 0 so you must regroup:
Take 1 from 2, so 2 becomes 1.
Add 10 to 0, so 0 becomes 10.
10 minus 2 is 8
1 minus 0 is 1

d.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 34
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 34
Explanation:
9 is greater than 8 so you must regroup:
Take 1 from 8, so 8 becomes 7.
Add 10 to 8, so 8 becomes 18.
18 minus 9 is 9
7 minus 4 is 3

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 35
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 35
Explanation:
8 is greater than 3 so you must regroup:
Take 1 from 7, so 7 becomes 6.
Add 10 to 3, so 3 becomes 13.
13 minus 8 is 5
6 minus 2 is 4
1 minus 0 is 1

f.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 36
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 36
Explanation:
Subtract the ones we get 2 – 1 = 1
Subtract the tens we get 7 – 6 = 1
So, the difference of 72 and 61 is 11
72 – 61 = 11

Question 7.
a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 37
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 37
Explanation:
6 is greater than 5 so you must regroup:
Take 1 from 3, so 3 becomes 2.
Add 10 to 5, so 5 becomes 15.
15 minus 6 is 9
2 minus 1 is 1

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 38
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 38
Explanation:
9 is greater than 8 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 0, so 0 becomes 10.
Take 1 from 10, so 10 becomes 9.
Add 10 to 8, so 8 becomes 18
18 minus 9 is 9
9 minus 1 is 8
0 minus 0 is 0

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 39
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 39
Explanation:
2 is greater than 1 so you must regroup:
Take 1 from 5, so 5 becomes 4.
Add 10 to 1, so 1 becomes 11.
11 minus 2 is 9
4 minus 3 is 1

d.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 40
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 40
Explanation:
Subtract the ones we get 5 – 5 = 0
Subtract the tens we get 2 – 1 = 1
Subtract the hundreds we get 1 – 0 = 1
So, the difference of 125 and 15 is 110
125 – 15 = 110

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 41
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 41
Explanation:
Subtract the ones we get 9 – 4 = 5
Subtract the tens we get 9 – 8 = 1
Subtract the hundreds we get 1 – 0 = 1
So, the difference of 199 and 84 is 115
199 – 84 = 115

f.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 42
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 42
Explanation:
6 is greater than 4 so you must regroup:
Take 1 from 8, so 8 becomes 7.
Add 10 to 4, so 4 becomes 14.
14 minus 6 is 8
7 minus 2 is 5

Question 8.
a.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 43
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 43
Explanation:
8 is greater than 7 so you must regroup:
Take 1 from 4, so 4 becomes 3.
Add 10 to 7, so 7 becomes 17.
17 minus 8 is 9
4 is greater than 3 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 3, so 3 becomes 13.
13 minus 4 is 9
0 minus 0 is 0

b.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 44
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 44
Explanation:
Subtract the ones we get 2 – 2 = 0
Subtract the tens we get 6 – 2 = 4
So, the difference of 62 and 22 is 40
62 – 22 = 40

c.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 45
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 45
Explanation:
Subtract the ones we get 7 – 2 = 5
Subtract the tens we get 5 – 3 = 2
So, the difference of 57 and 32 is 25
57 – 32 = 25

d.

Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 46
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 46
Explanation:
2 is greater than 1 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 1, so 1 becomes 11.
11 minus 2 is 9
1 is greater than 0 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 0, so 0 becomes 10
10 minus 1 is 9
0 minus 0 is 0

e.
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 47
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 47
Explanation:
8 is greater than 3 so you must regroup:
Take 1 from 2, so 2 becomes 1.
Add 10 to 3, so 3 becomes 13.
13 minus 8 is 5
4 is greater than 1 so you must regroup:
Take 1 from 1, so 1 becomes 0.
Add 10 to 1, so 1 becomes 11.
11 minus 4 is 7
0 minus 0 is 0

f.

Spectrum Math Grade 4 Chapter 1 Posttest Answer Key 48
Answer:
Spectrum Math Grade 4 Chapter 1 Posttest Answer Key img 48
Explanation:
9 is greater than 2 so you must regroup:
Take 1 from 9, so 9 becomes 8.
Add 10 to 2, so 2 becomes 12.
12 minus 9 is 3
8 minus 2 is 6

Solve each problem.

Question 9.
Tonya and her friends are collecting cans to recycle. Tonya has 55 cans, Irene has 32 cans, and Heather has 13 cans. How many cans do they have altogether?
They have __________ cans.
Answer:
100
Explanation:
Tonya has 55 cans
Irene has 32 cans
and Heather has 13 cans
They have 100 cans.
55 + 32 + 13 = 100
They have altogether 100 cans.

Question 10.
The football team is raising money by running a car wash. They need to wash 210 cars to raise enough money. They have washed 98 cars already. How many more cars do they need to wash?
They need to wash __________ more cars.
Answer:
112
Explanation:
The football team is raising money by running a car wash.
They need to wash 210 cars to raise enough money.
They have washed 98 cars already.
They need to wash 112 more cars.
210 – 98 = 112

Question 11.
Ms. Brooks’s science class is studying the environment around the school. Students counted 57 different plants and 25 different animals.
How many plants and animals did the class find altogether?
The class found ____ plants and animals.
Answer:
82
Explanation:
Ms. Brooks’s science class is studying the environment around the school.
Students counted 57 different plants and 25 different animals.
Total number of plants and animals they found altogether are 82
The class found 82 plants and animals.
57 + 25 = 82

Question 12.
On a field trip, two sisters found frog eggs in a pond. Dee found 82 eggs and Shay found 118 eggs. How many frog eggs did they find?
They found ____ frog eggs.
Answer:
200
Explanation:
On a field trip, two sisters found frog eggs in a pond.
Dee found 82 eggs and Shay found 118 eggs.
They found 200 frog eggs
82 + 118 = 200

Question 13.
At the bake sale, students brought in 115 cupcakes, 95 brownies, and 85 cookies. How many baked goods did the students bring in?
They brought in _________ baked goods.
Answer:
295
Explanation:
At the bake sale, students brought in 115 cupcakes, 95 brownies, and 85 cookies.
They brought in 295 baked goods.
115 + 95 + 85 = 295
Total baked goods 295

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