Triple Digit Addition Worksheets - Tims Printables - Free Printable
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Step-by-step solution for: Triple Digit Addition Worksheets - Tims Printables
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Show Answer Key & Explanations
Step-by-step solution for: Triple Digit Addition Worksheets - Tims Printables
Let’s solve each addition problem step by step. I’ll go one at a time and double-check my work.
---
Problem 1: 820 + 609
- 0 + 9 = 9
- 2 + 0 = 2
- 8 + 6 = 14 → write down 4, carry over 1? Wait — actually, since it’s hundreds place, 800 + 600 = 1400, so total is 1429.
✔ Answer: 1429
---
Problem 2: 313 + 407
- 3 + 7 = 10 → write 0, carry 1
- 1 + 0 + 1 (carry) = 2
- 3 + 4 = 7
✔ Answer: 720
Wait — let me check again:
313
+407
= (300+400) + (10+0) + (3+7) = 700 + 10 + 10 = 720 ✔
---
Problem 3: 229 + 871
- 9 + 1 = 10 → write 0, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 2 + 8 + 1 = 11 → write 11
So: 1100
✔ Answer: 1100
Check: 229 + 871 = (200+800)+(20+70)+(9+1)=1000+90+10=1100 ✔
---
Problem 4: 934 + 589
- 4 + 9 = 13 → write 3, carry 1
- 3 + 8 + 1 = 12 → write 2, carry 1
- 9 + 5 + 1 = 15 → write 15
So: 1523
✔ Answer: 1523
Check: 934 + 589 = 900+500=1400; 34+89=123; 1400+123=1523 ✔
---
Problem 5: 245 + 679
- 5 + 9 = 14 → write 4, carry 1
- 4 + 7 + 1 = 12 → write 2, carry 1
- 2 + 6 + 1 = 9
→ 924
✔ Answer: 924
Check: 245 + 679 = 200+600=800; 45+79=124; 800+124=924 ✔
---
Problem 6: 122 + 155
- 2 + 5 = 7
- 2 + 5 = 7
- 1 + 1 = 2
→ 277
✔ Answer: 277
---
Problem 7: 351 + 164
- 1 + 4 = 5
- 5 + 6 = 11 → write 1, carry 1
- 3 + 1 + 1 = 5
→ 515
✔ Answer: 515
Check: 351 + 164 = 300+100=400; 51+64=115; 400+115=515 ✔
---
Problem 8: 8 + 852
This is same as 852 + 8
- 2 + 8 = 10 → write 0, carry 1
- 5 + 0 + 1 = 6
- 8 + 0 = 8
→ 860
✔ Answer: 860
---
Problem 9: 670 + 118
- 0 + 8 = 8
- 7 + 1 = 8
- 6 + 1 = 7
→ 788
✔ Answer: 788
---
Problem 10: 356 + 890
- 6 + 0 = 6
- 5 + 9 = 14 → write 4, carry 1
- 3 + 8 + 1 = 12 → write 12
→ 1246
✔ Answer: 1246
Check: 356 + 890 = 300+800=1100; 56+90=146; 1100+146=1246 ✔
---
Problem 11: 967 + 106
- 7 + 6 = 13 → write 3, carry 1
- 6 + 0 + 1 = 7
- 9 + 1 = 10 → write 10
→ 1073
✔ Answer: 1073
Check: 967 + 106 = 900+100=1000; 67+6=73; 1000+73=1073 ✔
---
Problem 12: 307 + 569
- 7 + 9 = 16 → write 6, carry 1
- 0 + 6 + 1 = 7
- 3 + 5 = 8
→ 876
✔ Answer: 876
Check: 307 + 569 = 300+500=800; 7+69=76; 800+76=876 ✔
---
Problem 13: 433 + 801
- 3 + 1 = 4
- 3 + 0 = 3
- 4 + 8 = 12 → write 12
→ 1234
✔ Answer: 1234
---
Problem 14: 426 + 77
Think of 77 as 077
- 6 + 7 = 13 → write 3, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 4 + 0 + 1 = 5
→ 503
✔ Answer: 503
Check: 426 + 77 = 426 + 70 = 496; 496 + 7 = 503 ✔
---
Problem 15: 605 + 691
- 5 + 1 = 6
- 0 + 9 = 9
- 6 + 6 = 12 → write 12
→ 1296
✔ Answer: 1296
Check: 605 + 691 = 600+600=1200; 5+91=96; 1200+96=1296 ✔
---
Problem 16: 457 + 178
- 7 + 8 = 15 → write 5, carry 1
- 5 + 7 + 1 = 13 → write 3, carry 1
- 4 + 1 + 1 = 6
→ 635
✔ Answer: 635
Check: 457 + 178 = 400+100=500; 57+78=135; 500+135=635 ✔
---
Problem 17: 253 + 654
- 3 + 4 = 7
- 5 + 5 = 10 → write 0, carry 1
- 2 + 6 + 1 = 9
→ 907
✔ Answer: 907
Check: 253 + 654 = 200+600=800; 53+54=107; 800+107=907 ✔
---
Problem 18: 516 + 397
- 6 + 7 = 13 → write 3, carry 1
- 1 + 9 + 1 = 11 → write 1, carry 1
- 5 + 3 + 1 = 9
→ 913
✔ Answer: 913
Check: 516 + 397 = 500+300=800; 16+97=113; 800+113=913 ✔
---
Problem 19: 517 + 555
- 7 + 5 = 12 → write 2, carry 1
- 1 + 5 + 1 = 7
- 5 + 5 = 10 → write 10
→ 1072
✔ Answer: 1072
Check: 517 + 555 = 500+500=1000; 17+55=72; 1000+72=1072 ✔
---
Problem 20: 343 + 953
- 3 + 3 = 6
- 4 + 5 = 9
- 3 + 9 = 12 → write 12
→ 1296
✔ Answer: 1296
Wait — that’s same as problem 15? Let me check:
343 + 953:
300 + 900 = 1200
40 + 50 = 90
3 + 3 = 6
Total: 1200 + 90 + 6 = 1296 ✔ Yes, correct.
But wait — problem 15 was 605 + 691 = also 1296? That’s fine — different problems can have same answer.
Double-check 343 + 953:
343
+953
———
3+3=6
4+5=9
3+9=12 → so 1296 ✔
---
Now compiling all answers in order:
1. 1429
2. 720
3. 1100
4. 1523
5. 924
6. 277
7. 515
8. 860
9. 788
10. 1246
11. 1073
12. 876
13. 1234
14. 503
15. 1296
16. 635
17. 907
18. 913
19. 1072
20. 1296
All checked carefully.
Final Answer:
1. 1429
2. 720
3. 1100
4. 1523
5. 924
6. 277
7. 515
8. 860
9. 788
10. 1246
11. 1073
12. 876
13. 1234
14. 503
15. 1296
16. 635
17. 907
18. 913
19. 1072
20. 1296
---
Problem 1: 820 + 609
- 0 + 9 = 9
- 2 + 0 = 2
- 8 + 6 = 14 → write down 4, carry over 1? Wait — actually, since it’s hundreds place, 800 + 600 = 1400, so total is 1429.
✔ Answer: 1429
---
Problem 2: 313 + 407
- 3 + 7 = 10 → write 0, carry 1
- 1 + 0 + 1 (carry) = 2
- 3 + 4 = 7
✔ Answer: 720
Wait — let me check again:
313
+407
= (300+400) + (10+0) + (3+7) = 700 + 10 + 10 = 720 ✔
---
Problem 3: 229 + 871
- 9 + 1 = 10 → write 0, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 2 + 8 + 1 = 11 → write 11
So: 1100
✔ Answer: 1100
Check: 229 + 871 = (200+800)+(20+70)+(9+1)=1000+90+10=1100 ✔
---
Problem 4: 934 + 589
- 4 + 9 = 13 → write 3, carry 1
- 3 + 8 + 1 = 12 → write 2, carry 1
- 9 + 5 + 1 = 15 → write 15
So: 1523
✔ Answer: 1523
Check: 934 + 589 = 900+500=1400; 34+89=123; 1400+123=1523 ✔
---
Problem 5: 245 + 679
- 5 + 9 = 14 → write 4, carry 1
- 4 + 7 + 1 = 12 → write 2, carry 1
- 2 + 6 + 1 = 9
→ 924
✔ Answer: 924
Check: 245 + 679 = 200+600=800; 45+79=124; 800+124=924 ✔
---
Problem 6: 122 + 155
- 2 + 5 = 7
- 2 + 5 = 7
- 1 + 1 = 2
→ 277
✔ Answer: 277
---
Problem 7: 351 + 164
- 1 + 4 = 5
- 5 + 6 = 11 → write 1, carry 1
- 3 + 1 + 1 = 5
→ 515
✔ Answer: 515
Check: 351 + 164 = 300+100=400; 51+64=115; 400+115=515 ✔
---
Problem 8: 8 + 852
This is same as 852 + 8
- 2 + 8 = 10 → write 0, carry 1
- 5 + 0 + 1 = 6
- 8 + 0 = 8
→ 860
✔ Answer: 860
---
Problem 9: 670 + 118
- 0 + 8 = 8
- 7 + 1 = 8
- 6 + 1 = 7
→ 788
✔ Answer: 788
---
Problem 10: 356 + 890
- 6 + 0 = 6
- 5 + 9 = 14 → write 4, carry 1
- 3 + 8 + 1 = 12 → write 12
→ 1246
✔ Answer: 1246
Check: 356 + 890 = 300+800=1100; 56+90=146; 1100+146=1246 ✔
---
Problem 11: 967 + 106
- 7 + 6 = 13 → write 3, carry 1
- 6 + 0 + 1 = 7
- 9 + 1 = 10 → write 10
→ 1073
✔ Answer: 1073
Check: 967 + 106 = 900+100=1000; 67+6=73; 1000+73=1073 ✔
---
Problem 12: 307 + 569
- 7 + 9 = 16 → write 6, carry 1
- 0 + 6 + 1 = 7
- 3 + 5 = 8
→ 876
✔ Answer: 876
Check: 307 + 569 = 300+500=800; 7+69=76; 800+76=876 ✔
---
Problem 13: 433 + 801
- 3 + 1 = 4
- 3 + 0 = 3
- 4 + 8 = 12 → write 12
→ 1234
✔ Answer: 1234
---
Problem 14: 426 + 77
Think of 77 as 077
- 6 + 7 = 13 → write 3, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 4 + 0 + 1 = 5
→ 503
✔ Answer: 503
Check: 426 + 77 = 426 + 70 = 496; 496 + 7 = 503 ✔
---
Problem 15: 605 + 691
- 5 + 1 = 6
- 0 + 9 = 9
- 6 + 6 = 12 → write 12
→ 1296
✔ Answer: 1296
Check: 605 + 691 = 600+600=1200; 5+91=96; 1200+96=1296 ✔
---
Problem 16: 457 + 178
- 7 + 8 = 15 → write 5, carry 1
- 5 + 7 + 1 = 13 → write 3, carry 1
- 4 + 1 + 1 = 6
→ 635
✔ Answer: 635
Check: 457 + 178 = 400+100=500; 57+78=135; 500+135=635 ✔
---
Problem 17: 253 + 654
- 3 + 4 = 7
- 5 + 5 = 10 → write 0, carry 1
- 2 + 6 + 1 = 9
→ 907
✔ Answer: 907
Check: 253 + 654 = 200+600=800; 53+54=107; 800+107=907 ✔
---
Problem 18: 516 + 397
- 6 + 7 = 13 → write 3, carry 1
- 1 + 9 + 1 = 11 → write 1, carry 1
- 5 + 3 + 1 = 9
→ 913
✔ Answer: 913
Check: 516 + 397 = 500+300=800; 16+97=113; 800+113=913 ✔
---
Problem 19: 517 + 555
- 7 + 5 = 12 → write 2, carry 1
- 1 + 5 + 1 = 7
- 5 + 5 = 10 → write 10
→ 1072
✔ Answer: 1072
Check: 517 + 555 = 500+500=1000; 17+55=72; 1000+72=1072 ✔
---
Problem 20: 343 + 953
- 3 + 3 = 6
- 4 + 5 = 9
- 3 + 9 = 12 → write 12
→ 1296
✔ Answer: 1296
Wait — that’s same as problem 15? Let me check:
343 + 953:
300 + 900 = 1200
40 + 50 = 90
3 + 3 = 6
Total: 1200 + 90 + 6 = 1296 ✔ Yes, correct.
But wait — problem 15 was 605 + 691 = also 1296? That’s fine — different problems can have same answer.
Double-check 343 + 953:
343
+953
———
3+3=6
4+5=9
3+9=12 → so 1296 ✔
---
Now compiling all answers in order:
1. 1429
2. 720
3. 1100
4. 1523
5. 924
6. 277
7. 515
8. 860
9. 788
10. 1246
11. 1073
12. 876
13. 1234
14. 503
15. 1296
16. 635
17. 907
18. 913
19. 1072
20. 1296
All checked carefully.
Final Answer:
1. 1429
2. 720
3. 1100
4. 1523
5. 924
6. 277
7. 515
8. 860
9. 788
10. 1246
11. 1073
12. 876
13. 1234
14. 503
15. 1296
16. 635
17. 907
18. 913
19. 1072
20. 1296
Parent Tip: Review the logic above to help your child master the concept of math worksheet pdf.
