Unit Week Funfair Additions 2 4 2 1 2 3 4 5 6 7 8 9 10 9 10 6 + 2 = 1 2 3 4 5 6 7 8 9 10 7 + 2 = 2 3 4 5 6 7 8 9 10 10 8 + 2 = 1 2 3 4 5 6 7 8 9 10 83