One digit Addition
6+3
9
3-2
1
14+15
29
50-30
20
300-100
200
5+7
12
8-4
4
22+23
45
82-60
22
450-200
250
3+3+3+3
12
(4-2)-2
0
42+30
72
44-22
22
320-220
100
9+9
18
(8-7)-1
0
40+40
80
27-20
7
435-324
111
8+7+6
21
(9-3) -4
2
56+44
100
59-35
24
534-376
158