Regrouping

Regrouping involves changing a number from one form to an equivalent form. In the process, the number is renamed. Regrouping is helpful in doing arithmetic computations such as the following:

Example

 43
–  26

In long form, the regrouping is as follows (One of the tens in 43 is regrouped with the ones):

 43 = 30 + 13
–  26 =20 +6
10 + 7 = 17

In short form, the regrouping is as follows:

1
43
–  26
17

Did you know?

Many years ago, the regrouping shown in the example was called borrowing. Regrouping is more descriptive of the action needed to solve the problem.


Also called trading