Group 1: 90+10, 80+10, 65-20, 75-20, 40+20, 75+10, 60-30, 55-5, 50+20, 20+20, Group 2: 90, 100, 30, 70, 50, 35, 60, 85, 55, 40,

Adding and subtracting 2 digit numbers

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