1. 9 + 8 16 - 7 36 + 23 15 + 45 17 + 50 69 - 40 87 - 43 70 - 9

Решим примеры столбиком:

1.

$$9 + 8 = 17$$
$$16 - 7 = 9$$

2.

$$36 + 23 = 59$$
$$15 + 45 = 60$$

3.

$$17 + 50 = 67$$
$$69 - 40 = 29$$

4.

$$87 - 43 = 44$$
$$70 - 9 = 61$$