- Education and Science
How to work out percentages
Most math concepts can be simple if one understands what the question really is...
'Percent' is a two parts word and comes from the latin PER CENTUM translated it means 'Per one hundred' in actual facts the word really explains what it wants you to calculate...
A simple way of calculating Percentages is to use the 3 step method:
- determine what 100% of amount =
- 1% of amount = amount divided by 100
- ?%of amount = amount divided by 100 times ?% =
Lets plug in some numbers into the formula. It's easier to comprehend when there are actual numbers in a formula...
What is 15% of 500?
1)100% of amount = 500
2)1% of amount = 500 divided by 100 or (500/100)
3)15% of amount = 500 divided by 100 times 15 =75 or (500/100X15=75)
So the answer to what is 15% of 500 = 75
Lets do it again. What is 30% of 600 ?
1)100% = 600
2)1% = 600 / 100
3)30% = 600 / 100 X 30 = 180
So the answer to what is 30% of 600 = 180
If the question is reversed. How many percent is 75 of 500?
- 500 = 100%
- 1 = 100 / 500
- 75 = 100 / 500 x 75 = 15
answer 75 = 15 % of 500
Again How many percent is 180 of 600 ?
- 600 = 100%
- 1 = 100 / 600
- 180 = 100 / 600 x 180 = 30
answer 180 = 30 % of 600
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