how do you find 30% of 500 without calculator?

also how would you find 0.5% of 3200 without calculator?

is there a formula? i don't know where to start. i know 30/100 would be 3/10 and 0.5 is 1/2

2 answers

first step: STOP REPEATING THE POST!
here 'of' means multiplication.
Therefore 30% of 500 is,
(30/100)*500=150

o the same procedure to 0.5% of 3200 also