To solve this worksheet, we need to
find the missing addend in each equation. An “addend” is a number being added. Since each equation has three numbers adding up to a total (the sum), and one of them is missing (shown as a blank box), we can find the missing number by:
>
Subtracting the two known addends from the total sum.
Let’s go through each problem step by step.
---
1. `2 + 5 + □ = 9`
- Known addends: 2 and 5 → 2 + 5 = 7
- Missing addend = 9 – 7 =
2
✔ Answer:
2
---
2. `3 + 2 + □ = 7`
- 3 + 2 = 5
- Missing addend = 7 – 5 =
2
✔ Answer:
2
---
3. `2 + 1 + □ = 6`
- 2 + 1 = 3
- Missing addend = 6 – 3 =
3
✔ Answer:
3
---
4. `2 + □ + 4 = 8`
- 2 + 4 = 6
- Missing addend = 8 – 6 =
2
✔ Answer:
2
---
5. `1 + 3 + □ = 5`
- 1 + 3 = 4
- Missing addend = 5 – 4 =
1
✔ Answer:
1
---
6. `□ + 1 + 2 = 4`
- 1 + 2 = 3
- Missing addend = 4 – 3 =
1
✔ Answer:
1
---
7. `2 + □ + 2 = 8`
- 2 + 2 = 4
- Missing addend = 8 – 4 =
4
✔ Answer:
4
---
8. `1 + □ + 1 = 8`
- 1 + 1 = 2
- Missing addend = 8 – 2 =
6
✔ Answer:
6
---
9. `4 + 1 + □ = 6`
- 4 + 1 = 5
- Missing addend = 6 – 5 =
1
✔ Answer:
1
---
10. `□ + 3 + 3 = 7`
- 3 + 3 = 6
- Missing addend = 7 – 6 =
1
✔ Answer:
1
---
##
✔ Final Answers (in order):
1.
2
2.
2
3.
3
4.
2
5.
1
6.
1
7.
4
8.
6
9.
1
10.
1
---
## 🧠 Tip for Students:
To find a missing addend in an addition equation:
>
Total Sum – Sum of Known Addends = Missing Addend
This method works no matter where the missing box is — first, middle, or last!
Let me know if you’d like a printable version or more practice problems! 😊
Parent Tip: Review the logic above to help your child master the concept of math sheets to print out.
