ACMNA015 MA1-5NA For 4 students. Doubling and halving are very useful skills when adding, subtracting and estimating. In this game players will be given the opportunity to use doubles from double one to double twelve. Being a bingo type game the winner may be the first player with 3 counters in a row right up to being the first player to cover all the numbers on their card. 1 set contains 4 boards and an answer key. The game requires a 1-12 die.