PercenTable

Copy and complete this table without using a calculator!

  540 1080 1260 61620
10%
50%
25%
33⅓%
75%
90%

A Mathematics Lesson Starter Of The Day


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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 3.3 out of 5 based on 179 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 33 is one quarter 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.

Answers

  540 1080 1260 61620
10% 54 108 126 6162
50% 270 540 630 30810
25% 135 270 315 15405
33⅓% 180 360 420 20540
75% 405 810 945 46215
90% 486 972 1134 55458

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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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.

Transum.org/go/?Start=October16

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

Transum.org/go/?to=pchange

 

 


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