Addition within 20
13+7=
20
16-9=
7
11+4=
15
14-7=
7
5+9+8=
22
12+4=
16
12-8=
4
14+5=
19
18-5=
13
11+4+9
24
8+9=
17
19-13=
16
6+12=
18
16-10=
6
8+10+7
25
6+13=
19
15-9=
6
7+11=
18
19-6=
13
12+15+13=
40
15+3=
18
11-5=
6
18
15-7=
8
14+8+19=
41