SUBTRACTION (INTRO)

Just before you start.

2 โ€“ 1 = 1 when you subtract 1 from a number, the number decreases by a step. When you subtract 2 from a number, the number decreases by 2 steps. 7 โ€“ 2 = 5   

YOU HAVE 2 MINUTES TO COMPLETE EACH OF THE MENTAL DRILLS BELOW

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