Copy and complete this table without using a calculator!

  420 660 1500 26220

A Mathematics Lesson Starter Of The Day


Topics: Starter | Arithmetic | Mental Methods | Percentages

  • Transum,
  • Transum's exciting, fascinating and surprising starters are balanced by this more routine practice exercise. Having said that some pupils will find it a revelation when they learn (from other pupils) tricks for quickly working out these common percentages. A really useful way to spend the first ten minutes of the lesson.
  • Dylan T, Charnwood Primary Lichfield
  • This was a good starter especially if your target is percentages!
  • Faye D Year 6, Charnwood Primary Lichfield
  • A good starter as it got my brain working and lots of people found it challenging.

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This starter has scored a mean of 3.2 out of 5 based on 326 votes.

Previous Day | This starter is for 16 October | 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.


  420 660 1500 26220
10% 42 66 150 2622
50% 210 330 750 13110
25% 105 165 375 6555
33⅓% 140 220 500 8740
75% 315 495 1125 19665
90% 378 594 1350 23598

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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Texas Instruments Nspire Calculator

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Apple iPad Pro

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Online Maths Shop

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

Here a concise URL for a version of this page without the comments.

Here is the URL which will take them to a related student activity.

Student Activity


Curriculum Reference

See the National Curriculum page for links to related online activities and resources.


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