Arithmagons

26

36

32

The numbers at the vertices add up to the numbers
in the rectangles between them.

What number does each question mark represent?

A Mathematics Lesson Starter Of The Day


Topics: Starter | Algebra | Arithmetic | Puzzles

  • Transum,
  • Tuesday, June 3, 2014
  • "Don't miss the online arithmagons exercise for pupils containing 48 different levels of difficulty. Trophies are available for completing eight arithmagons at each level. The first level is very easy, maybe too easy, requiring you to fill in the rectangles given the three numbers in the circles at the vertices of the triangle. You can find this exercise at Transum.org/go/?to=Arithmagons and look for the 'Options' button that allows you to select the level of difficulty."
  • John B, Sydney, Australia
  • Wednesday, August 20, 2014
  • "My class loved this activity. We would like to see something like this again."

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This starter has scored a mean of 4.3 out of 5 based on 11 votes.


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Answers

The numbers at the vertices are 11, 15 and 21.

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.


Laptops In Lessons

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

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

Laptops In Lessons

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

Transum.org/go/?Start=August20

Here is the URL which will take them to a student version of this activity with many different levels of difficulty.

Transum.org/go/?to=Arithmagons

 

 




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