Odd Percent Out


20% of £220



50% of £198



5% of £240



10% of £510



50% of £102



10% of £230



20% of £455



25% of £364



5% of £1360



20% of £170



10% of £1070



25% of £176



10% of £990



25% of £272



10% of £560



10% of £340



25% of £92



5% of £1120



5% of £2140



20% of £420



50% of £24


Answers are in pairs. Which is the odd one out?

A Mathematics Lesson Starter Of The Day


Topics: Starter | Percentages

  • Cate, England
  • Option to change currency please!

    [Transum: The option to change currency is now available below. Thanks for the suggestion.]
  • McDonald, Oban
  • Why R? L is the only answer that is a decimal. That is an odd one out? I'll use this as a nice discussion point in my class. Thank you.
  • Transum,
  • It is up to the teacher whether to allow the use of calculators but most of the pupils attempting this starter should be able to work out each of these simple percentages in their heads or with pencil and paper. They should know strategies such as to work out 20% it is easy to find 10% and then double it. A pencil and paper will be needed to keep track of the answers so the odd one out, the one without a partner, can be identified.
  • C Clover, UK
  • Great page - would be even better if interactive so pupils could click on two that match and check they are correct.

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Previous Day | This starter is for 16 February | Next Day


% - This is the percent symbol.
Percent means 'out of 100'.

Find 50%:

As 50 is half of 100, then 50% means half. To find 50% of a quantity you need to halve (or divide by two). So 50% of 6 is 3.

Find 10%:

As 10 is one tenth of 100, then 10% means 'one tenth of'. To find 10% of a quantity you need to divide it by ten. So 10% of 800 is 80.

Find 25%:

As 25 is one quarter of 100, then 25% means 'one quarter of'. To find 25% of a quantity you need to divide it by four. So 25% of 20 is 5.

Another way of finding 25% of a quantity is first finding 50% then dividing the result by 2.

Find 33⅓%:

As 33⅓ is one third of 100, then 33⅓% means 'one third of'. To find 33⅓% of a quantity you need to divide it by three. So 33⅓% of 30 is 10.

Find 1%:

As 1 is one hundredth of 100, then 1% means 'one hundredth of'. To find 1% of a quantity you need to divide it by 100. So 1% of 800 is 8.

Find other percentages:

Other percentages can be found by combining some of the techniques mentioned above. Here are some examples:

If you need to use a calculator to check your working. See Calculator Workout skill 3.



Globe of Flags

This activity is suitable for students of mathematics all around the world. Use the button below to change the currency symbol used to make it more relevant to your students. You may wish to choose an unfamiliar currency to extend your students' experience.

Globe of Flags

Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.

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Laptops In Lessons

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Laptops In Lessons

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