A Mathematics Lesson Starter Of The Day

Drag the numbers into the yellow cells so that the totals along each side of the triangle are the same.







Once you have completed the above challenge, can you then rearrange the numbers so the total of each side is now different to your first solution. How many ways can this be done?


Now try this version:

Drag the numbers into the yellow cells so that the totals along each side of the triangle are the same.







Here are some more challenging, self checking, versions of this activity using:


Topics: Starter | Arithmetic | Investigations | Puzzles

  • Clue Giver,
  • Easy! Clue: 1st triangle= 9, 2nd= 18.
  • Jules, Devon
  • Brilliant.Got 12 on each side on the first one, 21 on each side for the second. If the children get stuck tell them to use the highest three numbers on the corners, bit of jigging and it always works.
  • Kashyap, Mt Roskill Intermediate, Auckland
  • Simple, either place the biggest three in the corners or the middle of the triangle, after that its easy.
  • Mathemaniac, South Wales
  • This can be used to demonstrate reflection and rotation (to get different triangles) and inversion (take each number from your first solution from 7).
  • Transum,
  • Don't miss the link below ('') which leads to a self-checking version of this activity for which pupils can earn trophies! One for each of the six levels. There is a method or strategy for solving this kind of puzzle and it is only when pupils have solved a number of different versions of the puzzle does the method become apparent.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
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This starter has scored a mean of 3.4 out of 5 based on 276 votes.

Previous Day | This starter is for 13 June | Next Day



Click here for a full set of answers.

There is a printable worksheet to go with this activity.


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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

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.




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