Odd Percent Out


50% of £190



25% of £364



20% of £455



10% of £190



5% of £2120



5% of £1320



10% of £270



25% of £264



10% of £480



20% of £180



5% of £240



25% of £144



50% of £96



5% of £1160



5% of £1660



20% of £135



10% of £1060



50% of £24



10% of £580



25% of £76



10% of £950


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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Casio Classwiz Calculator

There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).

As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols!

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Laptops In Lessons

Teacher, do your students have access to computers?
Do they have iPads or Laptops in Lessons?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

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Student Activity



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