True: 10+14 = 24, 29+30 = 59, 23+30 = 53, 57+10 = 67, 85-10 = 75, 63-20 = 43, 91-30 = 61, False: 40+23 = 33, 30+24 = 64, 74+20 = 104, 14-10 = 7, 58-30 = 88, 22-20 = 12, 9+30 = 49,

Adding and Subtracting multiples of 10

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