1
5 x (2 + 2) =
2
10 x (7 - 3) =
3
20 x (10 - 5) =
4
40 x (10 - 9) =
5
35 x (10 - 8) =
6
4 x (3 + 2) =
7
6 x (10 - 5) =
8
40 : (10 - 5) =
9
50 : (5 + 5) =
10
100 : (4 +6) =
11
80 : (8 - 3) =
12
10 : (5 - 3) =
13