Without doing lots of calculations, can you decide which of these number sentences are true? How do you know?
Where should you start, if you want to finish back where you started?
Use the information on these cards to draw the shape that is being described.
I start with a red, a green and a blue marble. I can trade any of my marbles for two others, one of each colour. Can I end up with five more blue marbles than red after a number of such trades?
