23 + 12 = 35
34 + 6 = 40
243 + 7 = 250
123 - 23 = 100
12 + 12 + 6 = 24 + 6 = 30
5 - 0 = 5
12 - 2 = 10
23+12=35
34+6=40
243+7=250
123-23=100
12+12+6=30
5-0=5
12-2=10
