Addition & Subtraction Practice Worksheet for 3-digit numbers.
Addition and subtraction practice worksheet with 20 problems for 3-digit numbers, featuring a clean layout with numbered exercises and a "Math Monks" logo.
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Step-by-step solution for: Addition and Subtraction Worksheets for Grade 3 with Answer Key
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Show Answer Key & Explanations
Step-by-step solution for: Addition and Subtraction Worksheets for Grade 3 with Answer Key
Let’s solve each problem one by one. We’ll do addition and subtraction carefully, starting from the rightmost digit (ones place) and moving left. If we need to borrow or carry, we’ll handle it step by step.
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Problem 1: 896 + 787
- Ones: 6 + 7 = 13 → write 3, carry 1
- Tens: 9 + 8 = 17, plus carried 1 = 18 → write 8, carry 1
- Hundreds: 8 + 7 = 15, plus carried 1 = 16 → write 16
→ 1683
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Problem 2: 954 - 556
- Ones: 4 - 6 → can’t do, borrow from tens. 14 - 6 = 8. Tens become 4.
- Tens: 4 - 5 → can’t do, borrow from hundreds. 14 - 5 = 9. Hundreds become 8.
- Hundreds: 8 - 5 = 3
→ 398
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Problem 3: 653 - 378
- Ones: 3 - 8 → borrow. 13 - 8 = 5. Tens become 4.
- Tens: 4 - 7 → borrow. 14 - 7 = 7. Hundreds become 5.
- Hundreds: 5 - 3 = 2
→ 275
---
Problem 4: 442 - 391
- Ones: 2 - 1 = 1
- Tens: 4 - 9 → borrow. 14 - 9 = 5. Hundreds become 3.
- Hundreds: 3 - 3 = 0 → don’t write leading zero
→ 51
---
Problem 5: 598 + 998
- Ones: 8 + 8 = 16 → write 6, carry 1
- Tens: 9 + 9 = 18, plus 1 = 19 → write 9, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→ 1596
---
Problem 6: 835 - 368
- Ones: 5 - 8 → borrow. 15 - 8 = 7. Tens become 2.
- Tens: 2 - 6 → borrow. 12 - 6 = 6. Hundreds become 7.
- Hundreds: 7 - 3 = 4
→ 467
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Problem 7: 811 - 385
- Ones: 1 - 5 → borrow. 11 - 5 = 6. Tens become 0.
- Tens: 0 - 8 → borrow. 10 - 8 = 2. Hundreds become 7.
- Hundreds: 7 - 3 = 4
→ 426
---
Problem 8: 795 - 217
- Ones: 5 - 7 → borrow. 15 - 7 = 8. Tens become 8.
- Tens: 8 - 1 = 7
- Hundreds: 7 - 2 = 5
→ 578
---
Problem 9: 996 - 674
- Ones: 6 - 4 = 2
- Tens: 9 - 7 = 2
- Hundreds: 9 - 6 = 3
→ 322
---
Problem 10: 492 + 908
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 9 + 0 = 9, plus 1 = 10 → write 0, carry 1
- Hundreds: 4 + 9 = 13, plus 1 = 14 → write 14
→ 1400
---
Problem 11: 669 - 245
- Ones: 9 - 5 = 4
- Tens: 6 - 4 = 2
- Hundreds: 6 - 2 = 4
→ 424
---
Problem 12: 366 - 198
- Ones: 6 - 8 → borrow. 16 - 8 = 8. Tens become 5.
- Tens: 5 - 9 → borrow. 15 - 9 = 6. Hundreds become 2.
- Hundreds: 2 - 1 = 1
→ 168
---
Problem 13: 178 + 444
- Ones: 8 + 4 = 12 → write 2, carry 1
- Tens: 7 + 4 = 11, plus 1 = 12 → write 2, carry 1
- Hundreds: 1 + 4 = 5, plus 1 = 6
→ 622
---
Problem 14: 693 - 398
- Ones: 3 - 8 → borrow. 13 - 8 = 5. Tens become 8.
- Tens: 8 - 9 → borrow. 18 - 9 = 9. Hundreds become 5.
- Hundreds: 5 - 3 = 2
→ 295
---
Problem 15: 999 - 754
- Ones: 9 - 4 = 5
- Tens: 9 - 5 = 4
- Hundreds: 9 - 7 = 2
→ 245
---
Problem 16: 549 - 255
- Ones: 9 - 5 = 4
- Tens: 4 - 5 → borrow. 14 - 5 = 9. Hundreds become 4.
- Hundreds: 4 - 2 = 2
→ 294
---
Problem 17: 941 + 735
- Ones: 1 + 5 = 6
- Tens: 4 + 3 = 7
- Hundreds: 9 + 7 = 16 → write 16
→ 1676
---
Problem 18: 396 + 854
- Ones: 6 + 4 = 10 → write 0, carry 1
- Tens: 9 + 5 = 14, plus 1 = 15 → write 5, carry 1
- Hundreds: 3 + 8 = 11, plus 1 = 12 → write 12
→ 1250
---
Problem 19: 849 - 207
- Ones: 9 - 7 = 2
- Tens: 4 - 0 = 4
- Hundreds: 8 - 2 = 6
→ 642
---
Problem 20: 572 + 998
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 7 + 9 = 16, plus 1 = 17 → write 7, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→ 1570
---
Final Answer:
1. 1683
2. 398
3. 275
4. 51
5. 1596
6. 467
7. 426
8. 578
9. 322
10. 1400
11. 424
12. 168
13. 622
14. 295
15. 245
16. 294
17. 1676
18. 1250
19. 642
20. 1570
---
Problem 1: 896 + 787
- Ones: 6 + 7 = 13 → write 3, carry 1
- Tens: 9 + 8 = 17, plus carried 1 = 18 → write 8, carry 1
- Hundreds: 8 + 7 = 15, plus carried 1 = 16 → write 16
→ 1683
---
Problem 2: 954 - 556
- Ones: 4 - 6 → can’t do, borrow from tens. 14 - 6 = 8. Tens become 4.
- Tens: 4 - 5 → can’t do, borrow from hundreds. 14 - 5 = 9. Hundreds become 8.
- Hundreds: 8 - 5 = 3
→ 398
---
Problem 3: 653 - 378
- Ones: 3 - 8 → borrow. 13 - 8 = 5. Tens become 4.
- Tens: 4 - 7 → borrow. 14 - 7 = 7. Hundreds become 5.
- Hundreds: 5 - 3 = 2
→ 275
---
Problem 4: 442 - 391
- Ones: 2 - 1 = 1
- Tens: 4 - 9 → borrow. 14 - 9 = 5. Hundreds become 3.
- Hundreds: 3 - 3 = 0 → don’t write leading zero
→ 51
---
Problem 5: 598 + 998
- Ones: 8 + 8 = 16 → write 6, carry 1
- Tens: 9 + 9 = 18, plus 1 = 19 → write 9, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→ 1596
---
Problem 6: 835 - 368
- Ones: 5 - 8 → borrow. 15 - 8 = 7. Tens become 2.
- Tens: 2 - 6 → borrow. 12 - 6 = 6. Hundreds become 7.
- Hundreds: 7 - 3 = 4
→ 467
---
Problem 7: 811 - 385
- Ones: 1 - 5 → borrow. 11 - 5 = 6. Tens become 0.
- Tens: 0 - 8 → borrow. 10 - 8 = 2. Hundreds become 7.
- Hundreds: 7 - 3 = 4
→ 426
---
Problem 8: 795 - 217
- Ones: 5 - 7 → borrow. 15 - 7 = 8. Tens become 8.
- Tens: 8 - 1 = 7
- Hundreds: 7 - 2 = 5
→ 578
---
Problem 9: 996 - 674
- Ones: 6 - 4 = 2
- Tens: 9 - 7 = 2
- Hundreds: 9 - 6 = 3
→ 322
---
Problem 10: 492 + 908
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 9 + 0 = 9, plus 1 = 10 → write 0, carry 1
- Hundreds: 4 + 9 = 13, plus 1 = 14 → write 14
→ 1400
---
Problem 11: 669 - 245
- Ones: 9 - 5 = 4
- Tens: 6 - 4 = 2
- Hundreds: 6 - 2 = 4
→ 424
---
Problem 12: 366 - 198
- Ones: 6 - 8 → borrow. 16 - 8 = 8. Tens become 5.
- Tens: 5 - 9 → borrow. 15 - 9 = 6. Hundreds become 2.
- Hundreds: 2 - 1 = 1
→ 168
---
Problem 13: 178 + 444
- Ones: 8 + 4 = 12 → write 2, carry 1
- Tens: 7 + 4 = 11, plus 1 = 12 → write 2, carry 1
- Hundreds: 1 + 4 = 5, plus 1 = 6
→ 622
---
Problem 14: 693 - 398
- Ones: 3 - 8 → borrow. 13 - 8 = 5. Tens become 8.
- Tens: 8 - 9 → borrow. 18 - 9 = 9. Hundreds become 5.
- Hundreds: 5 - 3 = 2
→ 295
---
Problem 15: 999 - 754
- Ones: 9 - 4 = 5
- Tens: 9 - 5 = 4
- Hundreds: 9 - 7 = 2
→ 245
---
Problem 16: 549 - 255
- Ones: 9 - 5 = 4
- Tens: 4 - 5 → borrow. 14 - 5 = 9. Hundreds become 4.
- Hundreds: 4 - 2 = 2
→ 294
---
Problem 17: 941 + 735
- Ones: 1 + 5 = 6
- Tens: 4 + 3 = 7
- Hundreds: 9 + 7 = 16 → write 16
→ 1676
---
Problem 18: 396 + 854
- Ones: 6 + 4 = 10 → write 0, carry 1
- Tens: 9 + 5 = 14, plus 1 = 15 → write 5, carry 1
- Hundreds: 3 + 8 = 11, plus 1 = 12 → write 12
→ 1250
---
Problem 19: 849 - 207
- Ones: 9 - 7 = 2
- Tens: 4 - 0 = 4
- Hundreds: 8 - 2 = 6
→ 642
---
Problem 20: 572 + 998
- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 7 + 9 = 16, plus 1 = 17 → write 7, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→ 1570
---
Final Answer:
1. 1683
2. 398
3. 275
4. 51
5. 1596
6. 467
7. 426
8. 578
9. 322
10. 1400
11. 424
12. 168
13. 622
14. 295
15. 245
16. 294
17. 1676
18. 1250
19. 642
20. 1570
Parent Tip: Review the logic above to help your child master the concept of subtraction practice worksheet 3rd grade.
