# How do you solve and check your solutions to #1/2m=21#?

##### 1 Answer

Sep 27, 2016

#### Explanation:

Estimate the answer first..

"Half of something is 21"..... the whole something is 42

Do the maths..

TO check: substitute 42 in the place of m.

=

This is the same as the answer that was given, so we have the correct value for m.