What is 5% of 88.5cm?

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Answer 1 · 2017-01-01T21:35:16

Introduction to a way of thinking about numbers.

$4.425$

5% is just another way of writing $5/100$

So we have $5/100" of "88.5" "->" "5/100xx88.5$

This is the same as $5xx(88.5)/100 = 5xx0.885$

But 5 is $1/2xx10$

So we can write $5xx0.885" as "1/2xx10xx0.885$

$=1/2xx8.85 = 4.425$