Выбери примеры на новый вычислительный прием. Реши их.
46 + 4
67 − 3
21 + 5
9 + 51
72 + 8
89 − 9
5 + 35
63 + 7
46 + 4 = (40 + 6) + 4 = 40 + (6 + 4) = 40 + 10 = 50
9 + 51 = 9 + (50 + 1) = 50 + (9 + 1) = 50 + 10 = 60
72 + 8 = (70 + 2) + 8 = 70 + (2 + 8) = 70 + 10 = 80
5 + 35 = 5 + (30 + 5) = 30 + (5 + 5) = 30 + 10 = 40
63 + 7 = (60 + 3) + 7 = 60 + (3 + 7) = 60 + 10 = 70