## How To Do Percentages

November 1, 2010 § 2 Comments

Percentages are another tricky subject that often confuses children at school! Just like fractions, there is so much to learn about working with percentages: finding the percentage of a quantity, changing decimals and fractions into percentages and vice versa, not to mention finding one quantity as a percentage of another! Percentages, though, are a vital tool for later life. Many of us use percentages in our day-to-day life without even thinking about it, simply by working out VAT!

So, what is a percentage? A percentage is a way of expressing a number as a portion of 100.

How do we use percentages? We say that 100 is the whole of something and the percentage is the amount of it we are using. (For example, we say that a whole cake is 100%. If I eat half of that cake, we are left with 50%.)

Very often, it is much easier to use fractions, but when it comes to really complicated fractions, it is sometimes just easier to say 79% instead of 79 hundredths! Again, percentages is one of those topics that a child can often fall behind in because they have not understood a certain part of it. That’s why it’s always best to start at the beginning if your child is ever going to be confident about using percentages in the 11+ exams or at any stage in their school life. Don’t forget that percentages will take up a few questions in GCSE mathematics!

Do I know what a percentage is?

Can I change a fraction into a percentage?

Can I change a decimal into a percentage?

Can I find the percentage of a quantity?

Do I know the simpler methods for using percentages like 25% and 50%?

If your child can answer “yes” to all those questions, they are a percentages maths star! If there are a few “no”s, try Maths Star’s 11+ Percentages page.

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### § 2 Responses to How To Do Percentages

• I think some adults could also do with brushing up on their maths skills – especially percentages!

• mathsstar says:

Yes, unfortunately it can be a big problem for parents to understand their children’s homework problems . . particularly when schools are teaching new methods!

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