Here are the answers to the worksheet problems.
Part A: Fill in the missing numbers
The commutative property means you can swap the order of the numbers being added, and the answer stays the same (like $a + b = b + a$).
1. $5 + 2 = \mathbf{2} + 5$
2. $3 + 6 = 6 + \mathbf{3}$
3. $6 + 9 = 9 + \mathbf{6}$
4. $4 + 8 = \mathbf{8} + 4$
5. $10 + 4 = \mathbf{4} + 10$
6. $7 + 1 = 1 + \mathbf{7}$
7. $3 + 4 + 5 = 3 + \mathbf{5} + 4$ (We swapped the 4 and the 5)
8. $7 + 8 + 1 = \mathbf{1} + 8 + 7$ (We moved the 1 to the front)
9. $1 + 10 + 6 = 6 + 1 + \mathbf{10}$ (The missing number is 10)
10. $9 + 2 + 3 = 3 + \mathbf{9} + 2$ (The missing number is 9)
Part B: Write addition equations
1.
Using addends 2 and 7:
* $2 + 7 = 9$
* $7 + 2 = 9$
2.
Using addends 1, 4, and 8:
*(Note: There are 6 possible ways to write this. Here are three correct examples)*
* $1 + 4 + 8 = 13$
* $4 + 1 + 8 = 13$
* $8 + 4 + 1 = 13$
Final Answer:
A)
1) 2
2) 3
3) 6
4) 8
5) 4
6) 7
7) 5
8) 1
9) 10
10) 9
B)
1) 2 + 7 = 9 and 7 + 2 = 9
2) Examples: 1 + 4 + 8 = 13; 4 + 1 + 8 = 13; 8 + 4 + 1 = 13
Parent Tip: Review the logic above to help your child master the concept of communicative property of addition worksheet.
