Can you prove these triangle theorems both ways?
Try out this number trick. What happens with different starting numbers? What do you notice?
The Number Jumbler can always work out your chosen symbol. Can you work out how?
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
Here is a selection of different shapes. Can you work out which ones are triangles, and why?
Can you sketch triangles that fit in the cells in this grid? Which ones are impossible? How do you know?
Join pentagons together edge to edge. Will they form a ring?
Gabriel multiplied together some numbers and then erased them. Can you figure out where each number was?
