# How do you turn a percent into a decimal?

Jan 17, 2015

Divide by 100, so 40%=0.40

Actually the word 'percent' means 'per 100' (maybe you recognize 'cent' as '100 in a dollar/euro/whatever').
So % is just short for "/100"

You might as well write 40% as $\frac{40}{100} = 0.40$

To turn a fraction into a percentage, you just do the reverse:

Multiply by 100, effectively doing 0.15=15/100=15%

It's really that easy!