Question 1.
6 + 2 = ___
2 + 6 = ___
6 + 2 = 8
2 + 6 = 8

Explanation:
The order of the addends does not matter
The sum does not change
So, 6 + 2 = 2 + 6.

Question 2.
14 + 4 = ___
4 + 14 = ___
14 + 4 = 18
4 + 14 = 18

Explanation:
The order of the addends does not matter
The sum does not change
So, 14 + 4 = 4 + 14.

Question 3.

Explanation:
The order of the addends does not matter
The sum does not change
So, 13 + 6 = 6 + 13.

Question 4.

Explanation:
The order of the addends does not matter
The sum does not change
So, 3 + 12 = 12 + 3.

Write the missing number.

Question 5.
12 + 7 = ___ + 12
12 + 7 = 7 + 12

Explanation:
The order of the addends does not matter
The sum does not change
The missing number is 7
So, 12 + 7 = 7 + 12.

Question 6.
3 + 6 = 6 + ___
3 + 6  = 6 + 3

Explanation:
The order of the addends does not matter
The sum does not change
The missing number is 3
So, 3 + 6 = 6 + 3.

Question 7.
___ + 4 = 4 + 11
11 + 4 = 4 + 11

Explanation:
The order of the addends does not matter
The sum does not change
The missing number is 11
So, 11+ 4 = 4 + 11.

Question 8.
2 + (4 + 3)
2 + ___ = ____
(2 + 4) + 3 =
___ + 3 = ___
2 + 4 + 3 = 9

Explanation:
2 + (4 + 3) =
2 + 7 = 9
(2 + 4) + 3 =
6 + 3 = 9
So, 2 + 4 + 3 = 9.

Question 9.
(1 + 3) + 11 =
___ + 11 = ___
1 + (3 + 11) =
1 + ___ = ____
1 + 3 + 11 = 15

Explanation:
(1 + 3) + 11 =
4 + 11 = 15
1 + (3 + 11) =
1 + 14 = 15
So, 1 + 3 + 11 = 15.

Question 10.
7 + (10 + 1) =
7 + ___ = ___
(7 + 10) + 1 = ___
___ + 1 = ___
7 + 10 + 1 = 18

Explanation:
7 + (10 + 1) =
7 + 11 = 18
(7 + 10) + 1 =
17 + 1 = 18
So, 7 + 10 + 1 = 18.

Question 11.
Use objects to help you solve this problem. Karen has a sheet of stickers. There are 14 green stickers, 2 gold stickers, and 3 red stickers on the sheet. How many stickers are there in all? Use ( ) to show two ways to group the addends.
14 + 2 + 3 = ____________
____ + ____ = ____ stickers
14 + 2 + 3 = ____________
___ + ____ = ___ stickers
14 + 2 + 3 = 19 stickers

Explanation:
Karen has a sheet of stickers
There are 14 green stickers, 2 gold stickers, and 3 red stickers on the sheet
I grouped the number using ( ) to solve
14 + (2 + 3) =
14 + 5 = 19 stickers
(14 + 2) + 3 =
16 + 3 = 19 stickers
There are 19 stickers in all with Karen.

Subtract.

Question 12.

Explanation:
The difference of 17 and 3 is 14.

Question 13.

Explanation:
The difference of 9 and 1 is 8.

Question 14.

Explanation:
The difference of 16 and 4 is 12.

Question 15.

Explanation:
The difference of 7 and 6 is 1.

Question 16.

Explanation:
The difference of 20 and 10 is 10.

Question 17.

Explanation:
The difference of 14 and 14 is 0.

Question 18.

Explanation:
The difference of 15 and 4 is 11.

Question 19.

Explanation:
The difference of 17 and 12 is 5.

Subtract. Write the difference. Then write the missing addend in the box.

Question 20.
11 + = 13

11 + 2 = 13

Explanation:
The difference of 13 and 11 is 2
So, the missing number is 2.

Question 21.
15 + = 19

15 + 4 = 19

Explanation:
The difference of 19 and 15 is 4
So, the missing number is 4.

Complete each fact family.

Question 22.
2 + 6 = ___
____ + ___ = ____
____ – ___ = ____
____ – ___ = ____
2 + 6 = 8
6 + 2 = 8
8 – 2 = 6
8 – 6 = 2

Explanation:
Some addition and subtraction facts use the same numbers
They are called fact family
I wrote the fact family for the numbers 2, 6 and 8.

Question 23.
13 – 3 = ___
____ – ___ = ____
____ + ___ = ____
____ + ___ = ____
13 – 3 = 10
13 – 10 = 3
10 + 3 = 13
3 + 10 = 13

Explanation:
Some addition and subtraction facts use the same numbers
They are called fact family
I wrote the fact family for the numbers 13, 3 and 10.

Question 24.
Write the fact family that includes 17, 6, and 11.
__ + __ = __ __ – __ = ____
__ + __ = __ __ – __ = ____
11 + 6 = 17
6 + 11 = 17
17 – 6 = 11
17 – 11 = 6

Explanation:
Some addition and subtraction facts use the same numbers
They are called fact family
I wrote the fact family for the numbers 17, 6 and 11.

Question 25.
Write the fact family that includes 19, 9, and 10.
__ + __ = __ __ – __ = ____
__ + __ = __ __ – __ = ____