Math worksheet with birthday-themed addition and subtraction problems for 3-digit numbers.
A black and white math worksheet titled "Birthday Party Problems" featuring 3-digit mixed addition and subtraction with regrouping exercises, with a cartoon illustration of two children in party hats celebrating with a cake and balloons.
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Show Answer Key & Explanations
Step-by-step solution for: 2nd Grade Math Worksheets - 3-Digit Mixed Addition and Subtraction ...
▼
Show Answer Key & Explanations
Step-by-step solution for: 2nd Grade Math Worksheets - 3-Digit Mixed Addition and Subtraction ...
Let's solve each of the 3-digit mixed addition and subtraction problems with regrouping from the worksheet titled *"Birthday Party Problems."* I'll go step by step, showing how to solve each problem, including regrouping (borrowing or carrying) when needed.
---
```
523
+ 786
-----
```
- Ones: 3 + 6 = 9 → write 9
- Tens: 2 + 8 = 10 → write 0, carry 1
- Hundreds: 5 + 7 + 1 (carry) = 13 → write 13
✔ Answer: 1,309
---
```
732
- 382
-----
```
- Ones: 2 - 2 = 0
- Tens: 3 - 8 → can't do, borrow 1 from hundreds
- 13 - 8 = 5
- Hundreds: 6 (after borrowing) - 3 = 3
✔ Answer: 350
---
```
441
+ 569
-----
```
- Ones: 1 + 9 = 10 → write 0, carry 1
- Tens: 4 + 6 + 1 = 11 → write 1, carry 1
- Hundreds: 4 + 5 + 1 = 10 → write 10
✔ Answer: 1,010
---
```
869
- 778
-----
```
- Ones: 9 - 8 = 1
- Tens: 6 - 7 → can't do, borrow 1 from hundreds
- 16 - 7 = 9
- Hundreds: 7 (after borrowing) - 7 = 0
✔ Answer: 91
---
```
339
+ 528
-----
```
- Ones: 9 + 8 = 17 → write 7, carry 1
- Tens: 3 + 2 + 1 = 6
- Hundreds: 3 + 5 = 8
✔ Answer: 867
---
```
889
- 699
-----
```
- Ones: 9 - 9 = 0
- Tens: 8 - 9 → can't do, borrow from hundreds
- 18 - 9 = 9
- Hundreds: 7 (after borrowing) - 6 = 1
✔ Answer: 190
---
```
412
+ 818
-----
```
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 1 + 1 + 1 = 3
- Hundreds: 4 + 8 = 12 → write 12
✔ Answer: 1,230
---
```
322
- 174
-----
```
- Ones: 2 - 4 → can't do, borrow from tens
- 12 - 4 = 8
- Tens: 1 (after borrowing) - 7 → can't do, borrow from hundreds
- 11 - 7 = 4
- Hundreds: 2 (after borrowing) - 1 = 1
✔ Answer: 148
---
```
274
+ 299
-----
```
- Ones: 4 + 9 = 13 → write 3, carry 1
- Tens: 7 + 9 + 1 = 17 → write 7, carry 1
- Hundreds: 2 + 2 + 1 = 5
✔ Answer: 573
---
```
323
- 168
-----
```
- Ones: 3 - 8 → borrow → 13 - 8 = 5
- Tens: 1 (after borrow) - 6 → borrow → 11 - 6 = 5
- Hundreds: 2 (after borrow) - 1 = 1
✔ Answer: 155
---
```
226
+ 286
-----
```
- Ones: 6 + 6 = 12 → write 2, carry 1
- Tens: 2 + 8 + 1 = 11 → write 1, carry 1
- Hundreds: 2 + 2 + 1 = 5
✔ Answer: 512
---
```
588
- 293
-----
```
- Ones: 8 - 3 = 5
- Tens: 8 - 9 → borrow → 18 - 9 = 9
- Hundreds: 4 (after borrow) - 2 = 2
✔ Answer: 295
---
```
726
+ 189
-----
```
- Ones: 6 + 9 = 15 → write 5, carry 1
- Tens: 2 + 8 + 1 = 11 → write 1, carry 1
- Hundreds: 7 + 1 + 1 = 9
✔ Answer: 915
---
```
659
- 368
-----
```
- Ones: 9 - 8 = 1
- Tens: 5 - 6 → borrow → 15 - 6 = 9
- Hundreds: 5 (after borrow) - 3 = 2
✔ Answer: 291
---
```
323
+ 592
-----
```
- Ones: 3 + 2 = 5
- Tens: 2 + 9 = 11 → write 1, carry 1
- Hundreds: 3 + 5 + 1 = 9
✔ Answer: 915
---
```
693
- 287
-----
```
- Ones: 3 - 7 → borrow → 13 - 7 = 6
- Tens: 8 (after borrow) - 8 = 0
- Hundreds: 6 - 2 = 4
✔ Answer: 406
---
```
342
+ 185
-----
```
- Ones: 2 + 5 = 7
- Tens: 4 + 8 = 12 → write 2, carry 1
- Hundreds: 3 + 1 + 1 = 5
✔ Answer: 527
---
```
404
- 272
-----
```
- Ones: 4 - 2 = 2
- Tens: 0 - 7 → borrow → 10 - 7 = 3
- Hundreds: 3 (after borrow) - 2 = 1
✔ Answer: 132
---
```
748
- 359
-----
```
- Ones: 8 - 9 → borrow → 18 - 9 = 9
- Tens: 3 (after borrow) - 5 → borrow → 13 - 5 = 8
- Hundreds: 6 (after borrow) - 3 = 3
✔ Answer: 389
---
```
532
+ 448
-----
```
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 3 + 4 + 1 = 8
- Hundreds: 5 + 4 = 9
✔ Answer: 980
---
```
545
- 267
-----
```
- Ones: 5 - 7 → borrow → 15 - 7 = 8
- Tens: 3 (after borrow) - 6 → borrow → 13 - 6 = 7
- Hundreds: 4 (after borrow) - 2 = 2
✔ Answer: 278
---
```
225
- 166
-----
```
- Ones: 5 - 6 → borrow → 15 - 6 = 9
- Tens: 1 (after borrow) - 6 → borrow → 11 - 6 = 5
- Hundreds: 1 (after borrow) - 1 = 0
✔ Answer: 59
---
```
878
+ 124
-----
```
- Ones: 8 + 4 = 12 → write 2, carry 1
- Tens: 7 + 2 + 1 = 10 → write 0, carry 1
- Hundreds: 8 + 1 + 1 = 10 → write 10
✔ Answer: 1,002
---
```
555
- 469
-----
```
- Ones: 5 - 9 → borrow → 15 - 9 = 6
- Tens: 4 (after borrow) - 6 → borrow → 14 - 6 = 8
- Hundreds: 4 (after borrow) - 4 = 0
✔ Answer: 86
---
## ✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 1. 523 + 786 | 1,309 |
| 2. 732 - 382 | 350 |
| 3. 441 + 569 | 1,010 |
| 4. 869 - 778 | 91 |
| 5. 339 + 528 | 867 |
| 6. 889 - 699 | 190 |
| 7. 412 + 818 | 1,230 |
| 8. 322 - 174 | 148 |
| 9. 274 + 299 | 573 |
|10. 323 - 168 | 155 |
|11. 226 + 286 | 512 |
|12. 588 - 293 | 295 |
|13. 726 + 189 | 915 |
|14. 659 - 368 | 291 |
|15. 323 + 592 | 915 |
|16. 693 - 287 | 406 |
|17. 342 + 185 | 527 |
|18. 404 - 272 | 132 |
|19. 748 - 359 | 389 |
|20. 532 + 448 | 980 |
|21. 545 - 267 | 278 |
|22. 225 - 166 | 59 |
|23. 878 + 124 | 1,002 |
|24. 555 - 469 | 86 |
---
All problems involve 3-digit numbers, with addition and subtraction, and many require regrouping (carrying or borrowing). The key steps are:
- Start from the right (ones place)
- Add or subtract digit by digit
- Regroup when needed (borrow from left if subtracting, carry to left if adding)
This worksheet is great for practicing mental math and arithmetic fluency!
Let me know if you'd like a printable version with answers filled in! 🎂🎈
---
Problem 1: 523 + 786
```
523
+ 786
-----
```
- Ones: 3 + 6 = 9 → write 9
- Tens: 2 + 8 = 10 → write 0, carry 1
- Hundreds: 5 + 7 + 1 (carry) = 13 → write 13
✔ Answer: 1,309
---
Problem 2: 732 - 382
```
732
- 382
-----
```
- Ones: 2 - 2 = 0
- Tens: 3 - 8 → can't do, borrow 1 from hundreds
- 13 - 8 = 5
- Hundreds: 6 (after borrowing) - 3 = 3
✔ Answer: 350
---
Problem 3: 441 + 569
```
441
+ 569
-----
```
- Ones: 1 + 9 = 10 → write 0, carry 1
- Tens: 4 + 6 + 1 = 11 → write 1, carry 1
- Hundreds: 4 + 5 + 1 = 10 → write 10
✔ Answer: 1,010
---
Problem 4: 869 - 778
```
869
- 778
-----
```
- Ones: 9 - 8 = 1
- Tens: 6 - 7 → can't do, borrow 1 from hundreds
- 16 - 7 = 9
- Hundreds: 7 (after borrowing) - 7 = 0
✔ Answer: 91
---
Problem 5: 339 + 528
```
339
+ 528
-----
```
- Ones: 9 + 8 = 17 → write 7, carry 1
- Tens: 3 + 2 + 1 = 6
- Hundreds: 3 + 5 = 8
✔ Answer: 867
---
Problem 6: 889 - 699
```
889
- 699
-----
```
- Ones: 9 - 9 = 0
- Tens: 8 - 9 → can't do, borrow from hundreds
- 18 - 9 = 9
- Hundreds: 7 (after borrowing) - 6 = 1
✔ Answer: 190
---
Problem 7: 412 + 818
```
412
+ 818
-----
```
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 1 + 1 + 1 = 3
- Hundreds: 4 + 8 = 12 → write 12
✔ Answer: 1,230
---
Problem 8: 322 - 174
```
322
- 174
-----
```
- Ones: 2 - 4 → can't do, borrow from tens
- 12 - 4 = 8
- Tens: 1 (after borrowing) - 7 → can't do, borrow from hundreds
- 11 - 7 = 4
- Hundreds: 2 (after borrowing) - 1 = 1
✔ Answer: 148
---
Problem 9: 274 + 299
```
274
+ 299
-----
```
- Ones: 4 + 9 = 13 → write 3, carry 1
- Tens: 7 + 9 + 1 = 17 → write 7, carry 1
- Hundreds: 2 + 2 + 1 = 5
✔ Answer: 573
---
Problem 10: 323 - 168
```
323
- 168
-----
```
- Ones: 3 - 8 → borrow → 13 - 8 = 5
- Tens: 1 (after borrow) - 6 → borrow → 11 - 6 = 5
- Hundreds: 2 (after borrow) - 1 = 1
✔ Answer: 155
---
Problem 11: 226 + 286
```
226
+ 286
-----
```
- Ones: 6 + 6 = 12 → write 2, carry 1
- Tens: 2 + 8 + 1 = 11 → write 1, carry 1
- Hundreds: 2 + 2 + 1 = 5
✔ Answer: 512
---
Problem 12: 588 - 293
```
588
- 293
-----
```
- Ones: 8 - 3 = 5
- Tens: 8 - 9 → borrow → 18 - 9 = 9
- Hundreds: 4 (after borrow) - 2 = 2
✔ Answer: 295
---
Problem 13: 726 + 189
```
726
+ 189
-----
```
- Ones: 6 + 9 = 15 → write 5, carry 1
- Tens: 2 + 8 + 1 = 11 → write 1, carry 1
- Hundreds: 7 + 1 + 1 = 9
✔ Answer: 915
---
Problem 14: 659 - 368
```
659
- 368
-----
```
- Ones: 9 - 8 = 1
- Tens: 5 - 6 → borrow → 15 - 6 = 9
- Hundreds: 5 (after borrow) - 3 = 2
✔ Answer: 291
---
Problem 15: 323 + 592
```
323
+ 592
-----
```
- Ones: 3 + 2 = 5
- Tens: 2 + 9 = 11 → write 1, carry 1
- Hundreds: 3 + 5 + 1 = 9
✔ Answer: 915
---
Problem 16: 693 - 287
```
693
- 287
-----
```
- Ones: 3 - 7 → borrow → 13 - 7 = 6
- Tens: 8 (after borrow) - 8 = 0
- Hundreds: 6 - 2 = 4
✔ Answer: 406
---
Problem 17: 342 + 185
```
342
+ 185
-----
```
- Ones: 2 + 5 = 7
- Tens: 4 + 8 = 12 → write 2, carry 1
- Hundreds: 3 + 1 + 1 = 5
✔ Answer: 527
---
Problem 18: 404 - 272
```
404
- 272
-----
```
- Ones: 4 - 2 = 2
- Tens: 0 - 7 → borrow → 10 - 7 = 3
- Hundreds: 3 (after borrow) - 2 = 1
✔ Answer: 132
---
Problem 19: 748 - 359
```
748
- 359
-----
```
- Ones: 8 - 9 → borrow → 18 - 9 = 9
- Tens: 3 (after borrow) - 5 → borrow → 13 - 5 = 8
- Hundreds: 6 (after borrow) - 3 = 3
✔ Answer: 389
---
Problem 20: 532 + 448
```
532
+ 448
-----
```
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 3 + 4 + 1 = 8
- Hundreds: 5 + 4 = 9
✔ Answer: 980
---
Problem 21: 545 - 267
```
545
- 267
-----
```
- Ones: 5 - 7 → borrow → 15 - 7 = 8
- Tens: 3 (after borrow) - 6 → borrow → 13 - 6 = 7
- Hundreds: 4 (after borrow) - 2 = 2
✔ Answer: 278
---
Problem 22: 225 - 166
```
225
- 166
-----
```
- Ones: 5 - 6 → borrow → 15 - 6 = 9
- Tens: 1 (after borrow) - 6 → borrow → 11 - 6 = 5
- Hundreds: 1 (after borrow) - 1 = 0
✔ Answer: 59
---
Problem 23: 878 + 124
```
878
+ 124
-----
```
- Ones: 8 + 4 = 12 → write 2, carry 1
- Tens: 7 + 2 + 1 = 10 → write 0, carry 1
- Hundreds: 8 + 1 + 1 = 10 → write 10
✔ Answer: 1,002
---
Problem 24: 555 - 469
```
555
- 469
-----
```
- Ones: 5 - 9 → borrow → 15 - 9 = 6
- Tens: 4 (after borrow) - 6 → borrow → 14 - 6 = 8
- Hundreds: 4 (after borrow) - 4 = 0
✔ Answer: 86
---
## ✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 1. 523 + 786 | 1,309 |
| 2. 732 - 382 | 350 |
| 3. 441 + 569 | 1,010 |
| 4. 869 - 778 | 91 |
| 5. 339 + 528 | 867 |
| 6. 889 - 699 | 190 |
| 7. 412 + 818 | 1,230 |
| 8. 322 - 174 | 148 |
| 9. 274 + 299 | 573 |
|10. 323 - 168 | 155 |
|11. 226 + 286 | 512 |
|12. 588 - 293 | 295 |
|13. 726 + 189 | 915 |
|14. 659 - 368 | 291 |
|15. 323 + 592 | 915 |
|16. 693 - 287 | 406 |
|17. 342 + 185 | 527 |
|18. 404 - 272 | 132 |
|19. 748 - 359 | 389 |
|20. 532 + 448 | 980 |
|21. 545 - 267 | 278 |
|22. 225 - 166 | 59 |
|23. 878 + 124 | 1,002 |
|24. 555 - 469 | 86 |
---
🎉 Summary:
All problems involve 3-digit numbers, with addition and subtraction, and many require regrouping (carrying or borrowing). The key steps are:
- Start from the right (ones place)
- Add or subtract digit by digit
- Regroup when needed (borrow from left if subtracting, carry to left if adding)
This worksheet is great for practicing mental math and arithmetic fluency!
Let me know if you'd like a printable version with answers filled in! 🎂🎈
Parent Tip: Review the logic above to help your child master the concept of 3 digit addition and subtraction worksheet without regrouping.
