addition to 20
8+7=
15
20-20=
0
60+30=
90
90-60=
30
70
9+5=
14
18-9=
9
55+30=
85
98-43=
55
65+76
141
10+9-
19
15-12=
3
67+21=
88
83-11
72
39+41
80
7+5=
12
19-7=
12
43+31=
74
67-52=
15
34+59
93
17
20-19
1
74+15=
89
100-99
1
45+89=
134