Let’s go through each part of the worksheet step by step.
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Part 1: Find the sum.
We are adding two numbers in each column.
1. 2 + 7 =
9
2. 7 + 2 =
9
3. 8 + 2 =
10
4. 2 + 8 =
10
5. 1 + 9 =
10
6. 9 + 1 =
10
✔ All correct.
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Part 2: Write the missing number.
These are about the commutative property — changing order doesn’t change the sum.
First box:
5 + ___ = 4 + 5
→ 4 + 5 = 9, so 5 + ___ = 9 → ___ =
4
Second box (same as first):
5 + ___ = 4 + 5 → again, ___ =
4
Third box:
7 + 3 = 3 + ___
→ 7 + 3 = 10, so 3 + ___ = 10 → ___ =
7
Fourth box (same as third):
7 + 3 = 3 + ___ → ___ =
7
✔ All correct.
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Part 3: Find the sum.
Left side:
4 + 3 =
7
3 + 4 =
7
5 + 3 =
8
3 + 5 =
8
Right side:
5 + 1 =
6
1 + 5 =
6
6 + 2 =
8
2 + 6 =
8
✔ All correct.
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Final Answer:
9, 9, 10, 10, 10, 10; 4, 4, 7, 7; 7, 7, 8, 8, 6, 6, 8, 8
Parent Tip: Review the logic above to help your child master the concept of math 1st grade worksheets.
