Maths

>

KS3

Numbers

Question

How would find 12/16 of 640?

3 years ago

ยท

17 Replies

ยท

4040 views

F

Francisco Lakin


Get A Free Cheatsheet For Numbers ๐Ÿ”ฅ

Use our concise notes and diagrams to only revise what you need to know.

By submitting your email, you agree to join our mailing list. You can unsubscribe at any time.

17 Answers

Sean K Profile Picture
Sean K Verified Sherpa Tutor โœ“

Experienced GCSE and A-level English teacher. AQA Examiner

20 reviews

Hi Francisco. You should divide 640 by 16, and then multiply it by 12. This gives you 480!

Found this useful? Give kudos!

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
L
Laiba Attar

The number 1 rule to remember when finding fraction of amounts is '' Divide by the bottom, times by the top''.

So in this case you would do 640/16 = 40, and then 'times by the top' so 40 x 12= 480.

Found this useful? Give kudos!

A
Adrine Andreasian

The best way to approach this question is to find 1/16 of 640. This can be done by dividing 640 by 16 -which gives us the answer of 40.

By spotting that 1/16 multiplied by 12 gives 12/16, we must also multiply 40 by 12- which gives us an answer of 480.

Therefore 12/16 of 640 is 480.

Found this useful? Give kudos!

Paige B Profile Picture
Paige B Verified Sherpa Tutor โœ“

I am a maths teacher with QTS, I have both KS3 and KS4 experience.

Whole number: 640 divide it by the denominator: 16 then take my answer and multiply it by the numerator: 12.


640/ 16 = 40

40 x 12 = 480

Found this useful? Give kudos!

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
Shilpa R Profile Picture
Shilpa R Verified Sherpa Tutor โœ“

Experienced School Teacher giving online tuitions

Hi Francisco,

In order to find 12/16 of 640 we need to know that (of) means (X) that is multiplication that is 12/16 X 640

So, first if you see the fraction 12/16 then you will see that both 12/16 are even numbers that means they can be reduced or simplified.

So, we will first reduce 12/16 by dividing the numerator and denominator by 4 which leads to 3/4.

Now the sum stands as 3/4 X 640

There are two ways to solve it

1) You do 3 X 640 = 1920 then divide by 4 which gives 480

2) You divide 640 by 4 first which gives 160 then you multiply by 3 = 480



I would recommend the second way to do the sum as this is a quicker method with less errors.

Found this useful? Give kudos!

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
Lindsey P Profile Picture
Lindsey P Verified Sherpa Tutor โœ“

I am an experienced Teacher of English, Maths, PSHE and Citizenship.

First of all you need to find 1/16 of 640. You can do this by calculating 640/16 = 40. So 1/16 of 640 is 40.


You need 12 of these so next calculate 40x12 = 120.


Therefore 12/16 of 640 is 120.

Found this useful? Give kudos!

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
D
Dawn M

First of all simplify the fraction, 12/16 by dividing the numerator and denominator by 4 to 3/4. Then find 1/4 of 640 by dividing 640 by 4 to get 160. Now to get 3/4, multiply the result by 3, 160 x 3 = 480.

Found this useful? Give kudos!

S
Sophia X

12/16 of 640 is same as 3/4 of 640 is same as 3 x 1/4 of 640= 3 x 160=480

Found this useful? Give kudos!

A
Abged Siddig

The easiest way to find a fraction of a number is to divide the number by the denominator, and then multiply by the numerator. So, in this case, 640/12 would give you 40. Then, 40 * 12 = 480. Hope this makes sense! :)

Found this useful? Give kudos!

J
John Rajnath

First simplify 12/16 to 3/4 (12/16 to 6/8 to 3/4)

We can find 1/4 of 640 (dividing by 4) which is 160.

So 3 quarters will be 3 lots 160 which is 480


Found this useful? Give kudos!

S
Suzzie Ukpong

12 /16 X 640= 12X640/16

=7680/16

=480

Found this useful? Give kudos!

N
Natasha Cornell

12/16 can be made into a nicer fraction by dividing both parts by 4 to give 3/4. Depending if on paper or using a calculator you could convert the fraction to a decimal 3/4 = 0.75 and do 640 x 0.75 (calculator). Or on paper 640 divided by 4, then multiply by 3.

Found this useful? Give kudos!

S
Sonia Altaf

When finding fractions of amounts there is a simple rule to remember, divide by the denominator and multiply by the numerator. For this example, first divide 640 by 16 which gives an answer of 40. Then multiply 40 by 12, this gives 480 which is the final answer !

Found this useful? Give kudos!

Christina R Profile Picture
Christina R Verified Sherpa Tutor โœ“

Qualified Maths teacher; one-to-one any age or small GCSE groups

9 reviews

Find 1/16 of 640 first by dividing 640 by 16 which is 40.

Then to find 12/16 of 640, multiply 40 by 12, which is 480.

12/16 of 640 = 480

Found this useful? Give kudos!

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
A
Amy Crooks

You can change the fraction into 3/4 (as 4 is the GCF of 12 and 16) - this is to make it easier to work it out

Then you would divide 640 by 4 to get 160

Then you multiply the 160 by 3 to get 480


Found this useful? Give kudos!

Think you can help?

More Maths KS3 Questions
Sherpa Badge

Need a KS3 Maths tutor?

Get started with a free online introductions with an experienced and qualified online tutor on Sherpa.

Find a KS3 Maths Tutor