Question

subtract 72-28
use regrouping or borrowing, to turn 1 of our tens into 10 __________

Answer 1

To subtract 72 - 28 using regrouping (or borrowing), you can follow these steps:

1. **Set up the problem:**
```
72
- 28
```

2. **Look at the ones column:**
Here you have 2 (from 72) and 8 (from 28). Since you cannot subtract 8 from 2, you need to borrow from the tens column.

3. **Borrow from the tens column:**
You can turn the 7 (in the tens place of 72) into 6, and then you add 10 to the 2 in the ones place, making it 12.

So, it looks like this now:
```
6 12 (after borrowing 1 from the 7)
- 28
```

4. **Now subtract the ones column:**
12 - 8 = 4.

5. **Then subtract the tens column:**
6 - 2 = 4.

6. **Combine the results:**
The answer is 44.

So, \(72 - 28 = 44\).