Free printable addition and subtraction worksheet for 3rd-grade math practice.
Educational worksheet: 3 Digit Addition and Subtraction Worksheets. Download and print for classroom or home learning activities.
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Step-by-step solution for: 3 Digit Addition and Subtraction Worksheets
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Show Answer Key & Explanations
Step-by-step solution for: 3 Digit Addition and Subtraction Worksheets
Let's solve each of the addition and subtraction problems step by step.
---
1. 147 + 65
```
147
+ 65
----
212
```
- 7 + 5 = 12 → write 2, carry 1
- 4 + 6 + 1 = 11 → write 1, carry 1
- 1 + 1 = 2
✔ 212
2. 249 + 54
```
249
+ 54
----
303
```
- 9 + 4 = 13 → write 3, carry 1
- 4 + 5 + 1 = 10 → write 0, carry 1
- 2 + 1 = 3
✔ 303
3. 480 + 96
```
480
+ 96
----
576
```
- 0 + 6 = 6
- 8 + 9 = 17 → write 7, carry 1
- 4 + 1 = 5
✔ 576
4. 724 + 77
```
724
+ 77
----
801
```
- 4 + 7 = 11 → write 1, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 7 + 1 = 8
✔ 801
5. 338 + 164
```
338
+164
----
502
```
- 8 + 4 = 12 → write 2, carry 1
- 3 + 6 + 1 = 10 → write 0, carry 1
- 3 + 1 + 1 = 5
✔ 502
6. 761 + 139
```
761
+139
----
900
```
- 1 + 9 = 10 → write 0, carry 1
- 6 + 3 + 1 = 10 → write 0, carry 1
- 7 + 1 + 1 = 9
✔ 900
7. 623 + 479
```
623
+479
----
1102
```
- 3 + 9 = 12 → write 2, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 6 + 4 + 1 = 11 → write 1, carry 1
- 1 (carry)
✔ 1102
8. 584 + 215
```
584
+215
----
799
```
- 4 + 5 = 9
- 8 + 1 = 9
- 5 + 2 = 7
✔ 799
---
9. 328 - 68
```
328
- 68
----
260
```
- 8 - 8 = 0
- 2 - 6 → can't do, borrow: 12 - 6 = 6, but 3 becomes 2
- 2 - 0 = 2 → wait, actually:
- 328 → after borrowing: 2 (hundreds), 12 (tens), 8 → no, better:
- 8 - 8 = 0
- 2 < 6 → borrow from 3 → 12 - 6 = 6, then 2 (from 3-1) - 0 = 2
→ 260
✔ 260
10. 169 - 74
```
169
- 74
----
95
```
- 9 - 4 = 5
- 6 - 7 → can't do → borrow: 16 - 7 = 9, 1 becomes 0
- 0 - 0 = 0? Wait: 169 → borrow from 1 → 0 (hundreds), 16 (tens), 9
- 16 - 7 = 9
- 0 - 0 = 0? But we have 1 in hundreds place → becomes 0 after borrow.
So: 95
✔ 95
11. 943 - 52
```
943
- 52
----
891
```
- 3 - 2 = 1
- 4 - 5 → can't → borrow: 14 - 5 = 9, 9 becomes 8
- 8 - 0 = 8
✔ 891
12. 517 - 63
```
517
- 63
----
454
```
- 7 - 3 = 4
- 1 - 6 → can't → borrow: 11 - 6 = 5, 5 becomes 4
- 4 - 0 = 4
✔ 454
13. 836 - 268
```
836
-268
----
568
```
- 6 - 8 → can't → borrow: 16 - 8 = 8, 3 becomes 2
- 2 - 6 → can't → borrow: 12 - 6 = 6, 8 becomes 7
- 7 - 2 = 5
✔ 568
14. 545 - 385
```
545
-385
----
160
```
- 5 - 5 = 0
- 4 - 8 → can't → borrow: 14 - 8 = 6, 5 becomes 4
- 4 - 3 = 1
✔ 160
15. 905 - 628
```
905
-628
----
277
```
- 5 - 8 → can't → borrow: 15 - 8 = 7, 0 becomes 9 (but need to borrow from 9)
- 0 becomes 10, but 9 → 8, so 10 - 2 = 8? Let's do it carefully:
- Units: 5 - 8 → borrow from tens → but tens is 0 → must borrow from hundreds
- Hundreds: 9 → 8, tens: 0 → 10, now borrow for units: tens become 9, units become 15
- 15 - 8 = 7
- Tens: 9 - 2 = 7
- Hundreds: 8 - 6 = 2
✔ 277
16. 734 - 461
```
734
-461
----
273
```
- 4 - 1 = 3
- 3 - 6 → can't → borrow: 13 - 6 = 7, 7 becomes 6
- 6 - 4 = 2
✔ 273
---
Addition:
1. 147 + 65 = 212
2. 249 + 54 = 303
3. 480 + 96 = 576
4. 724 + 77 = 801
5. 338 + 164 = 502
6. 761 + 139 = 900
7. 623 + 479 = 1102
8. 584 + 215 = 799
Subtraction:
9. 328 - 68 = 260
10. 169 - 74 = 95
11. 943 - 52 = 891
12. 517 - 63 = 454
13. 836 - 268 = 568
14. 545 - 385 = 160
15. 905 - 628 = 277
16. 734 - 461 = 273
---
Let me know if you'd like this formatted as a printable answer sheet!
---
Addition Problems
1. 147 + 65
```
147
+ 65
----
212
```
- 7 + 5 = 12 → write 2, carry 1
- 4 + 6 + 1 = 11 → write 1, carry 1
- 1 + 1 = 2
✔ 212
2. 249 + 54
```
249
+ 54
----
303
```
- 9 + 4 = 13 → write 3, carry 1
- 4 + 5 + 1 = 10 → write 0, carry 1
- 2 + 1 = 3
✔ 303
3. 480 + 96
```
480
+ 96
----
576
```
- 0 + 6 = 6
- 8 + 9 = 17 → write 7, carry 1
- 4 + 1 = 5
✔ 576
4. 724 + 77
```
724
+ 77
----
801
```
- 4 + 7 = 11 → write 1, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 7 + 1 = 8
✔ 801
5. 338 + 164
```
338
+164
----
502
```
- 8 + 4 = 12 → write 2, carry 1
- 3 + 6 + 1 = 10 → write 0, carry 1
- 3 + 1 + 1 = 5
✔ 502
6. 761 + 139
```
761
+139
----
900
```
- 1 + 9 = 10 → write 0, carry 1
- 6 + 3 + 1 = 10 → write 0, carry 1
- 7 + 1 + 1 = 9
✔ 900
7. 623 + 479
```
623
+479
----
1102
```
- 3 + 9 = 12 → write 2, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 6 + 4 + 1 = 11 → write 1, carry 1
- 1 (carry)
✔ 1102
8. 584 + 215
```
584
+215
----
799
```
- 4 + 5 = 9
- 8 + 1 = 9
- 5 + 2 = 7
✔ 799
---
Subtraction Problems
9. 328 - 68
```
328
- 68
----
260
```
- 8 - 8 = 0
- 2 - 6 → can't do, borrow: 12 - 6 = 6, but 3 becomes 2
- 2 - 0 = 2 → wait, actually:
- 328 → after borrowing: 2 (hundreds), 12 (tens), 8 → no, better:
- 8 - 8 = 0
- 2 < 6 → borrow from 3 → 12 - 6 = 6, then 2 (from 3-1) - 0 = 2
→ 260
✔ 260
10. 169 - 74
```
169
- 74
----
95
```
- 9 - 4 = 5
- 6 - 7 → can't do → borrow: 16 - 7 = 9, 1 becomes 0
- 0 - 0 = 0? Wait: 169 → borrow from 1 → 0 (hundreds), 16 (tens), 9
- 16 - 7 = 9
- 0 - 0 = 0? But we have 1 in hundreds place → becomes 0 after borrow.
So: 95
✔ 95
11. 943 - 52
```
943
- 52
----
891
```
- 3 - 2 = 1
- 4 - 5 → can't → borrow: 14 - 5 = 9, 9 becomes 8
- 8 - 0 = 8
✔ 891
12. 517 - 63
```
517
- 63
----
454
```
- 7 - 3 = 4
- 1 - 6 → can't → borrow: 11 - 6 = 5, 5 becomes 4
- 4 - 0 = 4
✔ 454
13. 836 - 268
```
836
-268
----
568
```
- 6 - 8 → can't → borrow: 16 - 8 = 8, 3 becomes 2
- 2 - 6 → can't → borrow: 12 - 6 = 6, 8 becomes 7
- 7 - 2 = 5
✔ 568
14. 545 - 385
```
545
-385
----
160
```
- 5 - 5 = 0
- 4 - 8 → can't → borrow: 14 - 8 = 6, 5 becomes 4
- 4 - 3 = 1
✔ 160
15. 905 - 628
```
905
-628
----
277
```
- 5 - 8 → can't → borrow: 15 - 8 = 7, 0 becomes 9 (but need to borrow from 9)
- 0 becomes 10, but 9 → 8, so 10 - 2 = 8? Let's do it carefully:
- Units: 5 - 8 → borrow from tens → but tens is 0 → must borrow from hundreds
- Hundreds: 9 → 8, tens: 0 → 10, now borrow for units: tens become 9, units become 15
- 15 - 8 = 7
- Tens: 9 - 2 = 7
- Hundreds: 8 - 6 = 2
✔ 277
16. 734 - 461
```
734
-461
----
273
```
- 4 - 1 = 3
- 3 - 6 → can't → borrow: 13 - 6 = 7, 7 becomes 6
- 6 - 4 = 2
✔ 273
---
✔ Final Answers:
Addition:
1. 147 + 65 = 212
2. 249 + 54 = 303
3. 480 + 96 = 576
4. 724 + 77 = 801
5. 338 + 164 = 502
6. 761 + 139 = 900
7. 623 + 479 = 1102
8. 584 + 215 = 799
Subtraction:
9. 328 - 68 = 260
10. 169 - 74 = 95
11. 943 - 52 = 891
12. 517 - 63 = 454
13. 836 - 268 = 568
14. 545 - 385 = 160
15. 905 - 628 = 277
16. 734 - 461 = 273
---
Let me know if you'd like this formatted as a printable answer sheet!
Parent Tip: Review the logic above to help your child master the concept of adding and subtracting worksheets.
