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How To Find The Percent of a Number Fast!



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in this video we're gonna focus on how

to find the percent of a number so let's

start with something simple let's say if

we have 400 what is 10% of 400 to find

10% of something simply move the decimal

one units are left so 10% of 400 is 40

well that's straightforward alright so

let's say if we want to find 20% of 500

what is 20% of 500 well first what is

10% of 500 well we know that 10% of 500

is going to be 50 if we move the decimal

one units to left now 20% is twice the

value of 10% so 20% has to be a hundred

because 50 times two is 100 and we can

check it you can check it by taking 500

and multiplying it by point 20 point 20

is equal to 20 percent so 500 times

point when T is 100 and so that's a

simple way in which you can mentally

find the percent of a number now let's

try some more examples so let's say if

we have 150 what is 30% of 150 so feel

free to pause the video and try so first

I'm going to find 10% of 150 so let's

move the decimal one units are left 10

percent of 150 is 15 so what's 30

percent of 150 well to go from 10% to

30% you need to multiply by 3 because 10

times 3 is 30 so what we need to do is

multiply 15 by 3 15 times 3 is 45 and so

30 percent of 150 is 45 and to check it

let's multiply 150 by 0.3 0 which is 30

percent so 150 times point 30 is 45

now here's another problem what is 15%

of 400 what would you do in this

situation well first let's find out what

10% is equal to 10% of 400 is 40 now

what is five percent of four hundred

five percent is half of ten percent so

if Tempah set is forty five percent is

20 now 15 percent is the sum of five

percent plus ten percent

so therefore fifteen percent is going to

be 40 plus 20 which in this case is 60

so this is fifteen percent of 400 that's

60 at the check-in let's multiply 400 by

0.15 and so you should get 60 now what

about this example what is 25% of 700

try that one so first let's find out

what 10% is 10% is 70 which means that

20% has to be what 20% is twice the

value of 10% so if we multiply 70 by two

that's gonna give us 140 now what is

five percent of seven hundred five

percent is half of 10% so half of

seventy is 35 so now to calculate 25% we

need to add up

20 plus five percent or we need to add

up one forty plus 35 and so zero plus 5

is 5 3 + 4 7 and so this will give us

175 so that's how you can mentally find

25 percent of 700 so in your calculator

to check it multiply 700 by point 2 5

and this should give you 175 now let's

work on one more problem so let's say if

we want to find 23% of 300 based on the

previous examples of what can we do feel

free to pause the video so the first

thing I would do is find the value of

10%

we know that 10% is gonna be 30 and now

I would find the value of 20% which

should be twice the value of 10% so 30

times 2 is 60 now what is the value of

1% if 10% is thirty one percent has to

be three he needs to move the decimal

two units to the left now if one percent

is three what's three percent it's gonna

be three times three so if one percent

is three three percent has to be 3 times

3 which is 9 now to get 23 percent we

simply need to add 20 percent plus 3

percent and so that's gonna be I put 60

percent here that should just be 60 so

it's the sum of 60 and 9 which is going

to be 69 so if we multiply 300 by point

23 that will give us 69 and so now you

know how to easily and mentally find a

percent of a number