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I need help on calculating percentages - who can help??

(19 Posts)
jellyjelly Thu 01-Jun-06 21:12:16

I cant remember how you work out a percentage from an amount ie

percentage of an amount but on a calc not manual.


006 Thu 01-Jun-06 21:13:57

Message withdrawn at poster's request.

nicnack2 Thu 01-Jun-06 21:15:32

multiple the amount by the % you want i.e

20% of say 100 is 100x20 and the % sign on calc ( i think) will go and work it out

JanH Thu 01-Jun-06 21:17:00

Put in smaller number
press divide
put in larger number
press % key

JanH Thu 01-Jun-06 21:18:00

eg 16 as % of 32:

key in 16
press divide
key in 32
press %

answer = 50

nicnack2 Thu 01-Jun-06 21:18:13

oops i have forgotten too

nicnack2 Thu 01-Jun-06 21:19:10

ur right jan divide. No wonder i didnt do higher maths

Donbean Thu 01-Jun-06 21:19:11

Janh you STAR!!!!!!!!!!!!!!!!!
That is by faar the easiest explanation i have EVER seen of how to do it...thanks

jellyjelly Thu 01-Jun-06 21:22:41

so 75 % of 440 can you explain this. I hate maths as i find it so hard.

JanH Thu 01-Jun-06 21:23:27

Pleasure, Donbean

jj, did that help or is that not what you want - if you're wanting to get eg 50% of something then you do use multiply:

using the same figures again

press times
press %

answer = 16

JanH Thu 01-Jun-06 21:24:11

press times
press %

answer = 330

JanH Thu 01-Jun-06 21:27:16

And if you want to subtract a percentage:

press times
press %
press minus
press equals

answer = 110

or to add a percentage

press times
press %
press plus
press equals

answer = 770


jellyjelly Thu 01-Jun-06 21:37:39

so is it always


JanH Thu 01-Jun-06 21:45:54

Yes - as long as you need to know what a given percentage of a given figure is:

eg for VAT on £200 -

press times
press %
answer = 35

jellyjelly Thu 01-Jun-06 21:47:03

yes i understand that now and have practiced. Next thing is

box of chocs500g on special with 20% free so how do i work that out?

soapbox Thu 01-Jun-06 21:51:02

500 times 20 divided by 100 = 100g

Take the percent of something is the percent no (20 in your example) divided by 100.

JanH Thu 01-Jun-06 21:52:06

press times
press % (= 100g)
press plus
press equals

answer = 600g

jellyjelly Thu 01-Jun-06 22:14:06

might have to think about this tonight and sleep on it. Thanks very much will be doing ratios tomorrow which i didnt get so might be online again.

JanH Thu 01-Jun-06 22:25:05

You can do these percentages roughly, without a calculator, if it helps.

10% is a tenth (divide by 10)
20% is a fifth (divide by 5)
25% is a quarter (divide by 4)

So if you're starting with 500:

10% is 50 (divide by 10)
20% is 100 (divide by 5)
25% is 125 (divide by 4)
30% is 150 (divide by 10 and then multiply by 3)

etc etc.

It's easier with nice round numbers like 100s but you can do it roughly even with less nice numbers by rounding up or down to the next nearest.

So for a number like 330, you could go up to 350 or down to 300 and work out a rough percentage based on that; then when you work out with your precise numbers using a calculator, you can check against your rough figures to see if they are in the same general area.

Also, VAT is quite easy to work out by using


where you halve the figure each time and then add the results.

Starting with 300:

10% = 30
5% = 15
2.5% = 7.5

17.5% = 52.5

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