10+10
20
10-8
2
2x2
4
4+(3x1)
7
70+30
100
50-50
0
3x5
15
(5x5)+25
50
32
9
121
72-20
52
13x2
26
20+(4+3)
27
23
8
40+89
129
123-43
80
3x8
24
39
42
16
136+297
433
345-78
267
9x3
(42)+(6x5)
72