adding
1+
67
7-1
6
1x9
9
40+90
130
516+87
147
20+40
60
23-9
14
10x9
90
40-20
20
897-56
841
234+40
274
209-49
160
40x90
3,600
423+890
1,313
1x100
100
409+5
414
456-90
366
200x40
8,000
90-45
45
45+90
135
5,000+56
5,056
3400-43
3,357
8,000x5
40,000
456+60
516
789-82
707