You may also like

problem icon

Two Dice

Find all the numbers that can be made by adding the dots on two dice.

problem icon

Biscuit Decorations

Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?

problem icon

Writing Digits

Lee was writing all the counting numbers from 1 to 20. She stopped for a rest after writing seventeen digits. What was the last number she wrote?

One Big Triangle

Age 5 to 7 Challenge Level:

Here are nine triangles.  Each one has three numbers on it.


Your challenge is to arrange these triangles to make one big triangle, so the numbers that touch add up to 10.

You can print out this copy of the triangles and cut them out, then try arranging them.  
If you prefer, here is a printable version of the triangles with the numbers represented on tens frames.
Alternatively, you could use the interactive below to drag and drop the small triangles to fill all the spaces in the big triangle.

Let us know how you go about trying to make the big triangle.
How did you get started?
What did you do next?

Full screen version

If you can see this message Flash may not be working in your browser
Please see to enable it.