60 + 40 = 100 20 + 80 = 100 90 + 10 = 100 30 + 70 = 100
100-30= 70 100-40= 60 100-90= 10 100-70= 30 100-80= 20
95 + 5 = 100 65 + 35= 100 55 + 45 = 100 35 + 65 = 100
100-35= 65 100-75= 25 100-45= 55 100-25= 75 100-85 = 15
CHALLENGE
89 + ? = 100 72 + ? = 100 59 + ? = 100 47 + ? = 1000
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