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

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Answer 1 · 2016-09-27T11:24:42

$m = 42$

Estimate the answer first..

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

Do the maths..

$color(red)(2xx)1/2 m = color(red)(2xx)21" "larr xx 2$ on both sides to cancel

$m = 42$

TO check: substitute 42 in the place of m.

$1/2 (42)$

= $21$

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

How do you solve and check your solutions to 1/2m=211/2m=21?