Let’s solve each addition problem step by step. Remember: we’re adding 3-digit numbers
without regrouping, which means in every column (ones, tens, hundreds), the sum of the digits will be less than 10 — so no carrying over!
We’ll go one problem at a time.
---
Problem 1: 542 + 130
- Ones: 2 + 0 = 2
- Tens: 4 + 3 = 7
- Hundreds: 5 + 1 = 6
→ Answer:
672
---
Problem 2: 251 + 232
- Ones: 1 + 2 = 3
- Tens: 5 + 3 = 8
- Hundreds: 2 + 2 = 4
→ Answer:
483
---
Problem 3: 416 + 301
- Ones: 6 + 1 = 7
- Tens: 1 + 0 = 1
- Hundreds: 4 + 3 = 7
→ Answer:
717
---
Problem 4: 151 + 340
- Ones: 1 + 0 = 1
- Tens: 5 + 4 = 9
- Hundreds: 1 + 3 = 4
→ Answer:
491
---
Problem 5: 221 + 120
- Ones: 1 + 0 = 1
- Tens: 2 + 2 = 4
- Hundreds: 2 + 1 = 3
→ Answer:
341
---
Problem 6: 326 + 412
- Ones: 6 + 2 = 8
- Tens: 2 + 1 = 3
- Hundreds: 3 + 4 = 7
→ Answer:
738
---
Problem 7: 561 + 321
- Ones: 1 + 1 = 2
- Tens: 6 + 2 = 8
- Hundreds: 5 + 3 = 8
→ Answer:
882
---
Problem 8: 542 + 130
(Same as Problem 1!)
→ Answer:
672
---
Problem 9: 234 + 613
- Ones: 4 + 3 = 7
- Tens: 3 + 1 = 4
- Hundreds: 2 + 6 = 8
→ Answer:
847
---
Problem 10: 205 + 443
- Ones: 5 + 3 = 8
- Tens: 0 + 4 = 4
- Hundreds: 2 + 4 = 6
→ Answer:
648
---
Problem 11: 258 + 140
- Ones: 8 + 0 = 8
- Tens: 5 + 4 = 9
- Hundreds: 2 + 1 = 3
→ Answer:
398
---
Problem 12: 542 + 430
- Ones: 2 + 0 = 2
- Tens: 4 + 3 = 7
- Hundreds: 5 + 4 = 9
→ Answer:
972
---
Problem 13: 634 + 114
- Ones: 4 + 4 = 8
- Tens: 3 + 1 = 4
- Hundreds: 6 + 1 = 7
→ Answer:
748
---
Problem 14: 241 + 324
- Ones: 1 + 4 = 5
- Tens: 4 + 2 = 6
- Hundreds: 2 + 3 = 5
→ Answer:
565
---
Problem 15: 230 + 120
- Ones: 0 + 0 = 0
- Tens: 3 + 2 = 5
- Hundreds: 2 + 1 = 3
→ Answer:
350
---
Problem 16: 412 + 341
- Ones: 2 + 1 = 3
- Tens: 1 + 4 = 5
- Hundreds: 4 + 3 = 7
→ Answer:
753
---
Problem 17: 157 + 412
- Ones: 7 + 2 = 9
- Tens: 5 + 1 = 6
- Hundreds: 1 + 4 = 5
→ Answer:
569
---
Problem 18: 432 + 322
- Ones: 2 + 2 = 4
- Tens: 3 + 2 = 5
- Hundreds: 4 + 3 = 7
→ Answer:
754
---
Problem 19: 224 + 132
- Ones: 4 + 2 = 6
- Tens: 2 + 3 = 5
- Hundreds: 2 + 1 = 3
→ Answer:
356
---
Problem 20: 253 + 432
- Ones: 3 + 2 = 5
- Tens: 5 + 3 = 8
- Hundreds: 2 + 4 = 6
→ Answer:
685
---
Final Answer:
1) 672
2) 483
3) 717
4) 491
5) 341
6) 738
7) 882
8) 672
9) 847
10) 648
11) 398
12) 972
13) 748
14) 565
15) 350
16) 753
17) 569
18) 754
19) 356
20) 685
Parent Tip: Review the logic above to help your child master the concept of 3 digit addition worksheet for grade 1.
