subtract 72-28

Question

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, \(72 - 28 = 44\).