Выполним вычисления столбиком:
70 - 7:
70 - 7 --- 63
40 - 18:
40 - 18 --- 22
90 - 6:
90 - 6 --- 84
60 - 2:
60 - 2 --- 58
50 - 24:
50 - 24 --- 26
70 - 42:
70 - 42 --- 28
Ответ: 70 - 7 = 63; 40 - 18 = 22; 90 - 6 = 84; 60 - 2 = 58; 50 - 24 = 26; 70 - 42 = 28