Subtraction must involve regrouping (borrowing) when the bottom digit in any column is larger than the digit above it. In one sense, borrowing is the reverse of the carrying what we have in addition.
- Regrouping is not required when the minuend in 1's, 10's , 100's or 1000's places is greater than the subtrahend.
- If zero (0) is subtracted from a number, the difference we get is the number itself, 6-0 =6
In this section we will be leaning more about subtraction with regrouping.