Addition
21 + 20
41
21/7
3
109-56
53
9*9
81
1/2 * 2/4
2/8 = 1/4
61 + 210
271
41/4
10.25
195-50
145
40*40
1600
4/5 * 4/5
1
100 + 200.5
300.5
60/2
30
100-300
-200
30*60
1800
6/8 * 5/8
30/64
71+71
142
70/5
14 or 0.2
190-39
151
6*5
30
21/7 * 5/7
105/49
150+150
300
81/9
9
1,000 - 295
705
12*12
144
61/61 * 21/61
1281/3721