15+5=
20
21+12=
33
50+50=
100
12-5=
7
19+19=
38
=12+6
18
15+13=
28
100+500=
600
6x2=
12
12x1
1
17+2
19
42+10=
52
152+12=
164
2x2=
4
16+8
24
10+10=
12+12=
1x1=
19+4
23
15+12=
27
60+60=
120
6x6=
9
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