2nd Grade Column Subtraction Worksheet - Regrouping from Tens into Ones

Problem Overview:

The task involves solving a series of 3-digit subtraction problems with regrouping (borrowing). The instructions specify that borrowing should only occur from the tens place into the ones place. After solving all the problems, we need to identify the largest and smallest answers and shade them accordingly.

Step-by-Step Solution:

#### Problem 1: \( 423 - 115 \)
```
423
- 115
-----
308
```
- Subtract the ones: \( 3 - 5 \) → Borrow 1 from the tens place, making it \( 13 - 5 = 8 \).
- Subtract the tens: \( 1 (after borrowing) - 1 = 0 \).
- Subtract the hundreds: \( 4 - 1 = 3 \).

#### Problem 2: \( 641 - 137 \)
```
641
- 137
-----
504
```
- Subtract the ones: \( 1 - 7 \) → Borrow 1 from the tens place, making it \( 11 - 7 = 4 \).
- Subtract the tens: \( 3 (after borrowing) - 3 = 0 \).
- Subtract the hundreds: \( 6 - 1 = 5 \).

#### Problem 3: \( 762 - 152 \)
```
762
- 152
-----
610
```
- Subtract the ones: \( 2 - 2 = 0 \).
- Subtract the tens: \( 6 - 5 = 1 \).
- Subtract the hundreds: \( 7 - 1 = 6 \).

#### Problem 4: \( 463 - 156 \)
```
463
- 156
-----
307
```
- Subtract the ones: \( 3 - 6 \) → Borrow 1 from the tens place, making it \( 13 - 6 = 7 \).
- Subtract the tens: \( 5 (after borrowing) - 5 = 0 \).
- Subtract the hundreds: \( 4 - 1 = 3 \).

#### Problem 5: \( 373 - 148 \)
```
373
- 148
-----
225
```
- Subtract the ones: \( 3 - 8 \) → Borrow 1 from the tens place, making it \( 13 - 8 = 5 \).
- Subtract the tens: \( 6 (after borrowing) - 4 = 2 \).
- Subtract the hundreds: \( 3 - 1 = 2 \).

#### Problem 6: \( 564 - 233 \)
```
564
- 233
-----
331
```
- Subtract the ones: \( 4 - 3 = 1 \).
- Subtract the tens: \( 6 - 3 = 3 \).
- Subtract the hundreds: \( 5 - 2 = 3 \).

#### Problem 7: \( 843 - 329 \)
```
843
- 329
-----
514
```
- Subtract the ones: \( 3 - 9 \) → Borrow 1 from the tens place, making it \( 13 - 9 = 4 \).
- Subtract the tens: \( 3 (after borrowing) - 2 = 1 \).
- Subtract the hundreds: \( 8 - 3 = 5 \).

#### Problem 8: \( 635 - 228 \)
```
635
- 228
-----
407
```
- Subtract the ones: \( 5 - 8 \) → Borrow 1 from the tens place, making it \( 15 - 8 = 7 \).
- Subtract the tens: \( 2 (after borrowing) - 2 = 0 \).
- Subtract the hundreds: \( 6 - 2 = 4 \).

#### Problem 9: \( 538 - 327 \)
```
538
- 327
-----
211
```
- Subtract the ones: \( 8 - 7 = 1 \).
- Subtract the tens: \( 3 - 2 = 1 \).
- Subtract the hundreds: \( 5 - 3 = 2 \).

#### Problem 10: \( 446 - 219 \)
```
446
- 219
-----
227
```
- Subtract the ones: \( 6 - 9 \) → Borrow 1 from the tens place, making it \( 16 - 9 = 7 \).
- Subtract the tens: \( 3 (after borrowing) - 1 = 2 \).
- Subtract the hundreds: \( 4 - 2 = 2 \).

#### Problem 11: \( 620 - 317 \)
```
620
- 317
-----
303
```
- Subtract the ones: \( 0 - 7 \) → Borrow 1 from the tens place, making it \( 10 - 7 = 3 \).
- Subtract the tens: \( 1 (after borrowing) - 1 = 0 \).
- Subtract the hundreds: \( 6 - 3 = 3 \).

#### Problem 12: \( 863 - 447 \)
```
863
- 447
-----
416
```
- Subtract the ones: \( 3 - 7 \) → Borrow 1 from the tens place, making it \( 13 - 7 = 6 \).
- Subtract the tens: \( 5 (after borrowing) - 4 = 1 \).
- Subtract the hundreds: \( 8 - 4 = 4 \).

#### Problem 13: \( 756 - 428 \)
```
756
- 428
-----
328
```
- Subtract the ones: \( 6 - 8 \) → Borrow 1 from the tens place, making it \( 16 - 8 = 8 \).
- Subtract the tens: \( 4 (after borrowing) - 2 = 2 \).
- Subtract the hundreds: \( 7 - 4 = 3 \).

#### Problem 14: \( 561 - 346 \)
```
561
- 346
-----
215
```
- Subtract the ones: \( 1 - 6 \) → Borrow 1 from the tens place, making it \( 11 - 6 = 5 \).
- Subtract the tens: \( 5 (after borrowing) - 4 = 1 \).
- Subtract the hundreds: \( 5 - 3 = 2 \).

#### Problem 15: \( 735 - 517 \)
```
735
- 517
-----
218
```
- Subtract the ones: \( 5 - 7 \) → Borrow 1 from the tens place, making it \( 15 - 7 = 8 \).
- Subtract the tens: \( 2 (after borrowing) - 1 = 1 \).
- Subtract the hundreds: \( 7 - 5 = 2 \).

#### Problem 16: \( 830 - 423 \)
```
830
- 423
-----
407
```
- Subtract the ones: \( 0 - 3 \) → Borrow 1 from the tens place, making it \( 10 - 3 = 7 \).
- Subtract the tens: \( 2 (after borrowing) - 2 = 0 \).
- Subtract the hundreds: \( 8 - 4 = 4 \).

#### Problem 17: \( 684 - 177 \)
```
684
- 177
-----
507
```
- Subtract the ones: \( 4 - 7 \) → Borrow 1 from the tens place, making it \( 14 - 7 = 7 \).
- Subtract the tens: \( 7 (after borrowing) - 7 = 0 \).
- Subtract the hundreds: \( 6 - 1 = 5 \).

#### Problem 18: \( 825 - 502 \)
```
825
- 502
-----
323
```
- Subtract the ones: \( 5 - 2 = 3 \).
- Subtract the tens: \( 2 - 0 = 2 \).
- Subtract the hundreds: \( 8 - 5 = 3 \).

#### Problem 19: \( 963 - 439 \)
```
963
- 439
-----
524
```
- Subtract the ones: \( 3 - 9 \) → Borrow 1 from the tens place, making it \( 13 - 9 = 4 \).
- Subtract the tens: \( 5 (after borrowing) - 3 = 2 \).
- Subtract the hundreds: \( 9 - 4 = 5 \).

#### Problem 20: \( 375 - 226 \)
```
375
- 226
-----
149
```
- Subtract the ones: \( 5 - 6 \) → Borrow 1 from the tens place, making it \( 15 - 6 = 9 \).
- Subtract the tens: \( 6 (after borrowing) - 2 = 4 \).
- Subtract the hundreds: \( 3 - 2 = 1 \).

Final Answers:

```
1) 308
2) 504
3) 610
4) 307
5) 225
6) 331
7) 514
8) 407
9) 211
10) 227
11) 303
12) 416
13) 328
14) 215
15) 218
16) 407
17) 507
18) 323
19) 524
20) 149
```

Identify Largest and Smallest Answers:

- Largest Answer: \( 610 \) (Problem 3)
- Smallest Answer: \( 149 \) (Problem 20)

Final Answer:

\[
\boxed{610 \text{ (green)}, 149 \text{ (yellow)}}
\]