Teen numbers - picture used as part of Under the Sea topic. The 10 fish on the left are stuck to the picture. The fish on the right are movable. Children work out how many fish there are and use number fans to show their answer. Class checks by counting altogether - put the 10 in their heads and count on from 10. The numeral cards work like arrow cards to show how the teen number is written and to show what the 2 digits actually mean.