Being collaborative

Can you put these four calculations into order of difficulty? How did you decide?

Can you find out which 3D shape your partner has chosen before they work out your shape?

Do you agree with Badger's statements? Is Badger's reasoning 'watertight'? Why or why not?

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.

Can you find combinations of strips of paper which equal the length of the black strip? If the length of the black is 1, how could you write the sum of the strips?

Can you find pairs of differently sized windows that cost the same?

What do you think is going to happen in this video clip? Are you surprised?

Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?

Cut differently-sized square corners from a square piece of paper to make boxes without lids. Do they all have the same volume?