We played a good maths game from my Games for Learning book using dried beans this week. The game is designed to increase understanding of the value of tens and uses estimating skills. You start with a bowl of dry beans (or other small objects) and ten small pots. You choose a target number and take a handful of beans you estimate to be the target number. You then count the beans into the pots (ten per pot) and record how many more or less you needed to get to the target. The next person then has their turn and the lowest scorer (being the one who got closest to the target) wins.
Harry got much more accurate after his first turn! He really enjoyed this and spent time after we finished sorting the beans into different types in their own pots (practising another useful maths skill).