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Strategies by colour

+1, +2, +3          -1, -2, -3          = 5          5 -          +0, -0          Doubles to 10

Double number subtractions          =10          10-

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+5          +3          What's the difference?          x1, divided by 1          x0          2 digits + 2 digits

2 digits - 2 digits          2 digits + 1 digit          2 digits - 1 digit

+10          -10          =20          Double numbers to 20          Double number subtractions and halves   x2/divided by 2          Double + 1          Balance to a double

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Jump to 10 and then the rest          x10, divided by 10          =100          100-          x5          divided by 5  x3          Divided by 3, Divisibility by 3

=1000          +9          +8          -9          -8          It must leave 9          x4          Divided by 4          x6      Divided by 6

x9, divided by 9, divisibility by 9          x7, divided by 7          x8, divided by 8

Speed quizzes up to 10x10

x11, Divided by 11, Divisibility by 11          x12, Divided by 12          Divisibility by 4          Divisibility by 6 

Divisibility by 7          Divisibility by 8          Speed quizzes up to 12x12

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