Sub Within 20
9-5=
4
15+4=
19
30+20=
50
25+4=
29
11+52=
63
10-3=
7
12+5=
17
20+40=
60
56+3=
59
60+36=
96
15-7=
9+9=
18
60+30=
90
40+8=
48
55+32=
87
17-7=
10
6+7=
13
50+30=
80
32+5=
37
63=12=
75
19-5=
14
12+3=
15
20+70=
90
51+7=
58
56=23=
79