Try out this number trick. What happens with different starting numbers? What do you notice?
This is a game in which your counters move in a spiral round the snail's shell. It is about understanding tens and units.
You have a set of the digits from 0 – 9. Can you arrange these in the five boxes to make two-digit numbers as close to the targets as possible?
If you put three beads onto a tens/ones abacus you could make the numbers 3, 30, 12 or 21. What numbers can be made with six beads?