Go through the Spectrum Math Grade 2 Answer Key Chapter 2 Posttest and get the proper assistance needed during your homework.

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Addition and Subtraction Facts through 20

7

Explanation:
Let us add 3 and 4.
Add 3 ones and 4 ones.
7 ones + 9 ones = 7 ones.
Write 6 in one’s place. Hence the answer is 7.

10

Explanation:
Let us add 8 and 2.
Add 8 ones and 2 ones.
8 ones + 2 ones = 10 ones.
10 ones = 1 ten + 0 ones
Write 0 in one’s place and carry 1 ten to ten’s place. Hence the addtion of two given numbers is 10.

12

Explanation:
Let us add 5 and 7.
Add 5 ones and 7 ones.
5 ones + 7 ones = 12 ones.
12 ones = 1 ten + 2 ones
Write 2 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 12.

3

Explanation:
Let us add 2 and 1.
Add 2 ones and 1 ones.
2 ones + 1 ones = 3 ones.
Hence the addition of the two given numbers is 3.

16

Explanation:
Let us add 9 and 7.
Add 9 ones and 7 ones.
9 ones + 7 ones = 16 ones.
16 ones = 1 ten + 6 ones
Write 6 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 16.

18

Explanation:
Let us add 9 and 9.
Add 9 ones and 9 ones.
9 ones + 9 ones = 18 ones.
18 ones = 1 ten + 8 ones
Write 8 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 18.

9

Explanation:
Let us add 1 and 8.
Add 1 ones and 8 ones.
1 ones + 8 ones = 9 ones.
Write 9 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 9.

13

Explanation:
Let us add 6 and 7.
Add 6 ones and 7 ones.
6 ones + 7 ones = 13 ones.
13 ones = 1 ten + 3 ones
Write 3 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 13.

6

Explanation:
Let us add 5 and 1.
Add 5 ones and 1 ones.
5 ones + 1 ones = 6 ones.
Write 6 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 6.

4

Explanation:
Let us add 0 and 4.
Add 0 ones and 4 ones.
0 ones + 4 ones = 4 ones.
Write 4 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 4.

14

Explanation:
Let us add 9 and 5.
Add 9 ones and 5 ones.
9 ones + 5 ones = 14 ones.
14 ones = 1 ten + 4 ones
Write 4 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 14.

5

Explanation:
Let us add 3 and 2.
Add 3 ones and 2 ones.
3 ones + 2 ones = 5 ones.
Write 5 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 5.

8

Explanation:
Let us add 6 and 2.
Add 6 ones and 2 ones.
6 ones + 2 ones = 8 ones.
Write 8 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 8.

20

Explanation:
Let us add 12 and 8.
Add 2 ones and 8 ones.
12 ones + 8 ones = 20 ones.
20 ones = 2 ten + 0 ones
Write 0 in one’s place and carry 2 ten to ten’s place. Hence the addition of two numbers is 20.

15

Explanation:
Let us add 8 and 7.
Add 8 ones and 7 ones.
8 ones + 7 ones = 15 ones.
15 ones = 1 ten + 5 ones
Write 5 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 15.

17

Explanation:
Let us add 9 and 8.
Add 9 ones and 8 ones.
9 ones + 8 ones = 17 ones.
17 ones = 1 ten + 7 ones
Write 7 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 17.

11

Explanation:
Let us add 5 and 6.
Add 5 ones and 6 ones.
5 ones + 6 ones = 11 ones.
11 ones = 1 ten + 1 ones
Write 1 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 11.

19

Explanation:
Let us add 14 and 5.
Add 4 ones and 5 ones.
5 ones + 7 ones = 12 ones.
12 ones = 1 ten + 2 ones
Write 2 in one’s place and carry 1 ten to ten’s place. Hence the addition of two numbers is 12.

9

Explanation:
Let us subtract 13 and 4.
Subtract 4 from 3. As 4 > 3 we cannot subtract 4 from 3. Therefore let us borrow 1 from ten’s place. Subtract 13 – 4 = 9.

6

Explanation:
Let us subtract 7 and 1.
Subtract 7 – 1 = 6. Hence the subtraction of the given two numbers is 6.

2

Explanation:
Let us subtract 4 and 2.
Now subtract 2 from 4. 4 -2 = 2. Hence the subtraction of the given two numbers is 2.

6

Explanation:
Let us subtract 14 and 8.
As 8 > 4 we cannot subtract 8 from 4. Therefore let us borrow 1 from ten’s place. Subtract 14 – 8 = 6. Hence the subtraction of the two given numbers is 6.

1

Explanation:
Let us subtract 10 and 9.
Now subtract 10 – 9 = 1. Hence the subtraction of the two given numbers is 1.

5

Explanation:
Let us subtract 5 and 0.
Now subtract 0 from 5. Hence the subtraction of the given two numbers is 5.

10

Explanation:
Let us subtract 19 and 9.
Now subtract the numbers from one’s place. 9 – 9 = 0. Bring down the remaining 1 to down. Hence the subtraction of the given two numbers is 19 – 9 = 10.

9

Explanation:
Let us subtract 15 and 6.
As 6 > 5 we cannot subtract 6 from 5. Therefore let us borrow 1 from ten’s place. Subtract 15 – 6 = 9. Hence the subtraction of the two given numbers is 9.

0

Explanation:
Let us subtract 6 and 6.
6 – 6 = 0. Hence the subtraction of the two given numbers is 0.

9

Explanation:
Let us subtract 17 and 8.
As 8 > 7 we cannot subtract 8 from 7. Therefore let us borrow 1 from ten’s place. Subtract 17 – 8 = 9. Hence the subtraction of the two given numbers is 9.

6

Explanation:
Let us subtract 8 and 2.
8 – 2 = 6. Hence the subtraction of the two given numbers is 6.

6

Explanation:
Let us subtract 12 and 6.
As 6 > 2 we cannot subtract 6 from 2. Therefore let us borrow 1 from ten’s place. Subtract 12 – 6 = 6. Hence the subtraction of the two given numbers is 6.

8

Explanation:
Let us subtract 16 and 8.
As 8 > 6 we cannot subtract 8 from 6. Therefore let us borrow 1 from ten’s place. Subtract 16 – 8 = 8. Hence the subtraction of the two given numbers is 8.

9

Explanation:
Let us subtract 18 and 9.
As 9 > 8 we cannot subtract 9 from 8. Therefore let us borrow 1 from ten’s place. Subtract 18 – 9 = 9. Hence the subtraction of the two given numbers is 9.

16

Explanation:
Let us subtract 20 and 4.
As 4 > 0 we cannot subtract 4 from 0. Therefore let us borrow 1 from ten’s place. Subtract 10 – 4 = 6. Next bring down the 1 in ten’s place. Hence the subtraction of the two given numbers is 16.

0

Explanation:
Let us subtract 20 and 4.
3 – 3 = 0. Hence the subtraction of the given two numbers is 0.

3

Explanation:
Let us subtract 11 and 8.
As 8 > 1 we cannot subtract 8 from 1. Therefore let us borrow 1 from ten’s place. Subtract 11 – 8 = 3. Hence the subtraction of the two given numbers is 3.

Solve each problem.

0

Explanation:
Let us subtract 9 and 9.
9 – 9 = 0. Hence the subtraction of the given two numbers is 0.

There are 15 bananas.

Joe takes 6.
How many bananas are left? ______
There are 9 bananas left.

Explanation:

Given,
No of bananas = 15
Joe took = 6 bananas
15 – 6 = 9 bananas

The Changs have 7 apples.

How many apples do they have now? ______
They have a total of 12 apples.

Explanation:
No of apple changs have = 7
Total = 5 + 7 = 12 apples.
Therefore they have 12 apples.

The store has 12 boxes of plums.

5 boxes of plums are sold. _____
How many boxes are left? _____
The number of boxes left is 7 plums.

Explanation:

Given,
The store has 12 boxes of plums.
5 boxes of plums are sold.
12 – 5 = 7 plums are left.

Together, Grace and her sister bought 18 bananas.
Grace bought9 bananas.

How many bananas did her sister buy? _____
Her sister bought a total number of 9 bananas.

Explanation:

Together, Grace and her sister bought 18 bananas.
Grace bought 9 bananas.
9 + 9 = 18
Her sister bought a total number of 9 bananas.

Mrs. Lopez has 19 hats.

3 of the hats have bows.
How many hats do not have bows? _______