Here is a selection of different shapes. Can you work out which ones are triangles, and why?

It's Sahila's birthday and she is having a party. How could you answer these questions using a picture, with things, with numbers or symbols?

How would you find out how many football cards Catrina has collected?

Can you sketch triangles that fit in the cells in this grid? Which ones are impossible? How do you know?

Can you find examples of magic crosses? Can you find all the possibilities?

I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?