ADDITION!!!
21+21
42
15 x 3
45
25/5
5
36-15
36/6
6
3000+600
3600
28 x 4
112
75/3
25
360-132
168
7/13 divided by 1/2
1 1/13
265+138
394
73 x 2
146
125/25
5
548-473
75
46/2
23
1097+131
1228
65 x 3
195
564/8
7.5
548-120
428
38 x 7
266
395+1356
1751
754 x 5
3765
2468/2
1234
677-130
547
647-464
183