Let’s solve each addition problem step by step. We’ll add the numbers column by column, starting from the right (ones place), then tens, then hundreds — and carry over if needed.
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Problem 1: 996 + 978
- Ones: 6 + 8 = 14 → write down 4, carry 1
- Tens: 9 + 7 = 16, plus carried 1 = 17 → write down 7, carry 1
- Hundreds: 9 + 9 = 18, plus carried 1 = 19 → write down 19
→
Answer: 1974
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Problem 2: 896 + 968
- Ones: 6 + 8 = 14 → write 4, carry 1
- Tens: 9 + 6 = 15, plus 1 = 16 → write 6, carry 1
- Hundreds: 8 + 9 = 17, plus 1 = 18 → write 18
→
Answer: 1864
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Problem 3: 795 + 998
- Ones: 5 + 8 = 13 → write 3, carry 1
- Tens: 9 + 9 = 18, plus 1 = 19 → write 9, carry 1
- Hundreds: 7 + 9 = 16, plus 1 = 17 → write 17
→
Answer: 1793
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Problem 4: 598 + 958
- Ones: 8 + 8 = 16 → write 6, carry 1
- Tens: 9 + 5 = 14, plus 1 = 15 → write 5, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→
Answer: 1556
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Problem 5: 597 + 938
- Ones: 7 + 8 = 15 → write 5, carry 1
- Tens: 9 + 3 = 12, plus 1 = 13 → write 3, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→
Answer: 1535
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Problem 6: 596 + 928
- Ones: 6 + 8 = 14 → write 4, carry 1
- Tens: 9 + 2 = 11, plus 1 = 12 → write 2, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→
Answer: 1524
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Problem 7: 595 + 968
- Ones: 5 + 8 = 13 → write 3, carry 1
- Tens: 9 + 6 = 15, plus 1 = 16 → write 6, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→
Answer: 1563
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Problem 8: 594 + 978
- Ones: 4 + 8 = 12 → write 2, carry 1
- Tens: 9 + 7 = 16, plus 1 = 17 → write 7, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→
Answer: 1572
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Problem 9: 593 + 998
- Ones: 3 + 8 = 11 → write 1, carry 1
- Tens: 9 + 9 = 18, plus 1 = 19 → write 9, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→
Answer: 1591
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Problem 10: 599 + 978
- Ones: 9 + 8 = 17 → write 7, carry 1
- Tens: 9 + 7 = 16, plus 1 = 17 → write 7, carry 1
- Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→
Answer: 1577
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Problem 11: 678 + 543
- Ones: 8 + 3 = 11 → write 1, carry 1
- Tens: 7 + 4 = 11, plus 1 = 12 → write 2, carry 1
- Hundreds: 6 + 5 = 11, plus 1 = 12 → write 12
→
Answer: 1221
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Problem 12: 876 + 555
- Ones: 6 + 5 = 11 → write 1, carry 1
- Tens: 7 + 5 = 12, plus 1 = 13 → write 3, carry 1
- Hundreds: 8 + 5 = 13, plus 1 = 14 → write 14
→
Answer: 1431
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Final Answer:
1974
1864
1793
1556
1535
1524
1563
1572
1591
1577
1221
1431
Parent Tip: Review the logic above to help your child master the concept of addition worksheet 3rd grade regrouping.
