Grade 3 addition worksheet with nine three-digit addition problems to find the sums.

Let’s solve each addition problem step by step. We’ll add the numbers column by column — ones, then tens, then hundreds — and carry over if needed.

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Problem 1: 724 + 547 + 597

Start with ones place:
4 + 7 + 7 = 18 → write down 8, carry 1

Tens place:
2 + 4 + 9 + 1 (carry) = 16 → write down 6, carry 1

Hundreds place:
7 + 5 + 5 + 1 (carry) = 18 → write down 18

→ 1868

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Problem 2: 453 + 234 + 654

Ones: 3 + 4 + 4 = 11 → write 1, carry 1
Tens: 5 + 3 + 5 + 1 = 14 → write 4, carry 1
Hundreds: 4 + 2 + 6 + 1 = 13 → write 13

→ 1341

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Problem 3: 768 + 879 + 657

Ones: 8 + 9 + 7 = 24 → write 4, carry 2
Tens: 6 + 7 + 5 + 2 = 20 → write 0, carry 2
Hundreds: 7 + 8 + 6 + 2 = 23 → write 23

→ 2304

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Problem 4: 945 + 454 + 334

Ones: 5 + 4 + 4 = 13 → write 3, carry 1
Tens: 4 + 5 + 3 + 1 = 13 → write 3, carry 1
Hundreds: 9 + 4 + 3 + 1 = 17 → write 17

→ 1733

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Problem 5: 456 + 878 + 567

Ones: 6 + 8 + 7 = 21 → write 1, carry 2
Tens: 5 + 7 + 6 + 2 = 20 → write 0, carry 2
Hundreds: 4 + 8 + 5 + 2 = 19 → write 19

→ 1901

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Problem 6: 234 + 432 + 546

Ones: 4 + 2 + 6 = 12 → write 2, carry 1
Tens: 3 + 3 + 4 + 1 = 11 → write 1, carry 1
Hundreds: 2 + 4 + 5 + 1 = 12 → write 12

→ 1212

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Problem 7: 327 + 358 + 893

Ones: 7 + 8 + 3 = 18 → write 8, carry 1
Tens: 2 + 5 + 9 + 1 = 17 → write 7, carry 1
Hundreds: 3 + 3 + 8 + 1 = 15 → write 15

→ 1578

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Problem 8: 569 + 121 + 871

Ones: 9 + 1 + 1 = 11 → write 1, carry 1
Tens: 6 + 2 + 7 + 1 = 16 → write 6, carry 1
Hundreds: 5 + 1 + 8 + 1 = 15 → write 15

→ 1561

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Problem 9: 987 + 345 + 234

Ones: 7 + 5 + 4 = 16 → write 6, carry 1
Tens: 8 + 4 + 3 + 1 = 16 → write 6, carry 1
Hundreds: 9 + 3 + 2 + 1 = 15 → write 15

→ 1566

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Final Answer:
1. 1868
2. 1341
3. 2304
4. 1733
5. 1901
6. 1212
7. 1578
8. 1561
9. 1566