What is 5% of 88.5cm?

1 Answer
Jan 1, 2017

Answer:

Introduction to a way of thinking about numbers.

#4.425#

Explanation:

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#