Let's solve each of the
"Missing Addends" problems step by step. The goal is to find the missing number that, when added to the given number, makes the total on the right side of the equation.
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Problem 1:
9 + □ = 15
To find the missing addend:
15 − 9 =
6
✔ Answer:
6
---
Problem 2:
□ + 8 = 14
14 − 8 =
6
✔ Answer:
6
---
Problem 3:
□ + 5 = 13
13 − 5 =
8
✔ Answer:
8
---
Problem 4:
5 + □ = 13
13 − 5 =
8
✔ Answer:
8
---
Problem 5:
8 + □ = 16
16 − 8 =
8
✔ Answer:
8
---
Problem 6:
□ + 3 = 12
12 − 3 =
9
✔ Answer:
9
---
Problem 7:
□ + 7 = 14
14 − 7 =
7
✔ Answer:
7
---
Problem 8:
7 + □ = 15
15 − 7 =
8
✔ Answer:
8
---
Problem 9:
3 + □ = 10
10 − 3 =
7
✔ Answer:
7
---
Problem 10:
□ + 6 = 14
14 − 6 =
8
✔ Answer:
8
---
Problem 11:
□ + 2 = 11
11 − 2 =
9
✔ Answer:
9
---
Problem 12:
5 + □ = 16
16 − 5 =
11
✔ Answer:
11
---
Problem 13:
4 + □ = 18
18 − 4 =
14
✔ Answer:
14
---
Problem 14:
□ + 2 = 10
10 − 2 =
8
✔ Answer:
8
---
Problem 15:
□ + 6 = 13
13 − 6 =
7
✔ Answer:
7
---
Problem 16:
6 + □ = 13
13 − 6 =
7
✔ Answer:
7
---
Problem 17:
5 + □ = 12
12 − 5 =
7
✔ Answer:
7
---
Problem 18:
□ + 8 = 17
17 − 8 =
9
✔ Answer:
9
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✔ Final Answers (in order):
1. 6
2. 6
3. 8
4. 8
5. 8
6. 9
7. 7
8. 8
9. 7
10. 8
11. 9
12. 11
13. 14
14. 8
15. 7
16. 7
17. 7
18. 9
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📝 Explanation:
We used
subtraction to find the missing addend because:
> If:
> a + b = c
> Then:
> b = c − a
So, we subtracted the known addend from the sum to get the missing one.
This method works for all these problems and helps build foundational arithmetic skills.
Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of 2nd grade math worksheet free printables.
