Решим примеры столбиком.
73 – 45
73 -45 --- 28
82 – 37
82 -37 --- 45
29 + 16
29 +16 --- 45
56 + 34
56 +34 --- 90
54 – 37
54 -37 --- 17
48 – 42
48 -42 --- 06
Ответ: 73 – 45 = 28; 82 – 37 = 45; 29 + 16 = 45; 56 + 34 = 90; 54 – 37 = 17; 48 – 42 = 6