Subtraction Circles- NRICH

Perhaps have a bowl and this is a bath. How can we fill it. Put two different items in the{...}

How can we sort and classify numbers- What makes a number even? What makes a number odd? How can we{...}

https://nrich.maths.org/234/index   Try and work out where the colours go. Work in pairs to see if you can work it{...}