80 + 20 = 100
900 + 100 = 1000
600 + 400 = 1000
90 + 10 = 100
70 + 30 = 100
700 + 300 = 1000
800 + 200 = 1000
60 + 40 = 100
200 + 800 = 1000
500 + 500 = 1000
50 + 50 = 100
20 + 80 = 100
