Let's solve each of the addition and subtraction problems step by step. We'll go row by row, solving each operation carefully.
---
1. 513 + 227
```
513
+ 227
-----
```
- Units: 3 + 7 = 10 → write down
0, carry
1
- Tens: 1 + 2 + 1 (carry) = 4
- Hundreds: 5 + 2 = 7
✔ Answer: 740
---
2. 619 + 368
```
619
+ 368
-----
```
- Units: 9 + 8 = 17 → write
7, carry
1
- Tens: 1 + 6 + 1 = 8
- Hundreds: 6 + 3 = 9
✔ Answer: 987
---
3. 427 + 145
```
427
+ 145
-----
```
- Units: 7 + 5 = 12 → write
2, carry
1
- Tens: 2 + 4 + 1 = 7
- Hundreds: 4 + 1 = 5
✔ Answer: 572
---
4. 262 + 524
```
262
+ 524
-----
```
- Units: 2 + 4 = 6
- Tens: 6 + 2 = 8
- Hundreds: 2 + 5 = 7
✔ Answer: 786
---
5. 315 + 462
```
315
+ 462
-----
```
- Units: 5 + 2 = 7
- Tens: 1 + 6 = 7
- Hundreds: 3 + 4 = 7
✔ Answer: 777
---
6. 635 - 171
```
635
- 171
-----
```
- Units: 5 - 1 = 4
- Tens: 3 - 7 → can't do, borrow from hundreds
- 13 - 7 = 6, hundreds become 5
- Hundreds: 5 - 1 = 4
✔ Answer: 464
---
7. 796 - 452
```
796
- 452
-----
```
- Units: 6 - 2 = 4
- Tens: 9 - 5 = 4
- Hundreds: 7 - 4 = 3
✔ Answer: 344
---
8. 423 - 248
```
423
- 248
-----
```
- Units: 3 - 8 → can't do, borrow from tens
- But tens is 2, so borrow from hundreds
- Hundreds: 4 → 3, tens: 2 → 12, now units: 13 - 8 = 5
- Tens: 1 (after borrow) - 4 → can't do, borrow from hundreds again?
- Wait, better to do it properly:
Actually:
- Start with 423
- Subtract 248
Breakdown:
- Units: 3 < 8 → borrow from tens → but tens is 2 → so borrow from hundreds
- Hundreds: 4 → 3
- Tens: 2 → 12, then lend 1 to units → units: 13, tens: 11
- Units: 13 - 8 = 5
- Tens: 11 - 4 = 7
- Hundreds: 3 - 2 = 1
✔ Answer: 175
---
9. 674 - 239
```
674
- 239
-----
```
- Units: 4 - 9 → borrow from tens
- Tens: 7 → 6, units: 14 - 9 = 5
- Tens: 6 - 3 = 3
- Hundreds: 6 - 2 = 4
✔ Answer: 435
---
10. 867 - 423
```
867
- 423
-----
```
- Units: 7 - 3 = 4
- Tens: 6 - 2 = 4
- Hundreds: 8 - 4 = 4
✔ Answer: 444
---
✔ Final Answers:
1. 513 + 227 =
740
2. 619 + 368 =
987
3. 427 + 145 =
572
4. 262 + 524 =
786
5. 315 + 462 =
777
6. 635 - 171 =
464
7. 796 - 452 =
344
8. 423 - 248 =
175
9. 674 - 239 =
435
10. 867 - 423 =
444
---
You can fill these answers into the blank grids in the image accordingly. Let me know if you'd like a visual layout!
Parent Tip: Review the logic above to help your child master the concept of year 3 subtraction worksheet.
