10 % of 40? (explain please!)

2 Answers
smendyka
Mar 6, 2018

See a solution process below:

Explanation:

"Percent" or "%" means "out of 100" or "per 100", Therefore 10% can be written as 10/100.

When dealing with percents the word "of" means "times" or "to multiply".

Finally, lets call the number we are looking for "n".

Putting this altogether we can write this equation and solve for n while keeping the equation balanced:

n = 10/100 xx 40

n = 400/100

n = 4

Cameron ยท EZ as pi
Mar 6, 2018

4

Explanation:

10% can be written as 10/100 or 1/10 or 0.1

When asked to find 10% you simply multiply the number by
0.1 or 1/10. which is the same as dividing by 10

If you don't have a calculator you can simply divide by 10 by taking off a zero or move the decimal point one place to the left.

e.g 10 % " of " 20 take off the 0 to get 2.
e.g 10% " of " 30 take off the 0 to get 3.

Therefore 10% " of " 40 you take off the 0 and get 4.

You can prove this as 40xx0.1=4

In a more complicated example, 10%" of " 55 you would have to move the decimal point. 55 can also be written as 55.0 so the answer would be 5.5

Hope this was helpful

Related questions
Impact of this question
2857 views around the world
You can reuse this answer
Creative Commons License