50+60
110
250-20
230
10x10
100
120+20
140
55-33
22
7x6
42
358+299
657
146-142
4
55x2
999+39
1038
555-67
488
55x55
3025
9999+9999
19998
9999999-99
9999900
100x10000
1000000