Three-Digit Addition Worksheets - Free Printable

Let’s solve each addition problem step by step. We’ll add the numbers carefully, one at a time.

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1) 785 + 349

Start with ones: 5 + 9 = 14 → write 4, carry 1
Tens: 8 + 4 = 12, plus carried 1 = 13 → write 3, carry 1
Hundreds: 7 + 3 = 10, plus carried 1 = 11 → write 11
→ 1134

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2) 468 + 807

Ones: 8 + 7 = 15 → write 5, carry 1
Tens: 6 + 0 = 6, plus 1 = 7
Hundreds: 4 + 8 = 12 → write 12
→ 1275

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3) 180 + 573

Ones: 0 + 3 = 3
Tens: 8 + 7 = 15 → write 5, carry 1
Hundreds: 1 + 5 = 6, plus 1 = 7
→ 753

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4) 128 + 915

Ones: 8 + 5 = 13 → write 3, carry 1
Tens: 2 + 1 = 3, plus 1 = 4
Hundreds: 1 + 9 = 10 → write 10
→ 1043

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5) 659 + 264

Ones: 9 + 4 = 13 → write 3, carry 1
Tens: 5 + 6 = 11, plus 1 = 12 → write 2, carry 1
Hundreds: 6 + 2 = 8, plus 1 = 9
→ 923

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6) 816 + 450

Ones: 6 + 0 = 6
Tens: 1 + 5 = 6
Hundreds: 8 + 4 = 12 → write 12
→ 1266

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7) 563 + 694

Ones: 3 + 4 = 7
Tens: 6 + 9 = 15 → write 5, carry 1
Hundreds: 5 + 6 = 11, plus 1 = 12 → write 12
→ 1257

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8) 380 + 750

Ones: 0 + 0 = 0
Tens: 8 + 5 = 13 → write 3, carry 1
Hundreds: 3 + 7 = 10, plus 1 = 11 → write 11
→ 1130

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9) 973 + 562

Ones: 3 + 2 = 5
Tens: 7 + 6 = 13 → write 3, carry 1
Hundreds: 9 + 5 = 14, plus 1 = 15 → write 15
→ 1535

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10) 285 + 447

Ones: 5 + 7 = 12 → write 2, carry 1
Tens: 8 + 4 = 12, plus 1 = 13 → write 3, carry 1
Hundreds: 2 + 4 = 6, plus 1 = 7
→ 732

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11) 896 + 658

Ones: 6 + 8 = 14 → write 4, carry 1
Tens: 9 + 5 = 14, plus 1 = 15 → write 5, carry 1
Hundreds: 8 + 6 = 14, plus 1 = 15 → write 15
→ 1554

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12) 173 + 764

Ones: 3 + 4 = 7
Tens: 7 + 6 = 13 → write 3, carry 1
Hundreds: 1 + 7 = 8, plus 1 = 9
→ 937

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13) 560 + 942

Ones: 0 + 2 = 2
Tens: 6 + 4 = 10 → write 0, carry 1
Hundreds: 5 + 9 = 14, plus 1 = 15 → write 15
→ 1502

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14) 256 + 194

Ones: 6 + 4 = 10 → write 0, carry 1
Tens: 5 + 9 = 14, plus 1 = 15 → write 5, carry 1
Hundreds: 2 + 1 = 3, plus 1 = 4
→ 450

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15) 648 + 479

Ones: 8 + 9 = 17 → write 7, carry 1
Tens: 4 + 7 = 11, plus 1 = 12 → write 2, carry 1
Hundreds: 6 + 4 = 10, plus 1 = 11 → write 11
→ 1127

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Final Answer:
1) 1134
2) 1275
3) 753
4) 1043
5) 923
6) 1266
7) 1257
8) 1130
9) 1535
10) 732
11) 1554
12) 937
13) 1502
14) 450
15) 1127