10+10=
20
2*2=
4
5-3=
2
20:5=
32
9
67+67=
134
6*7=
42
67-32=
35
49:7=
7
42=
16
34+33=
67
8*9=
72
113-98=
15
81:9=
73=
343
217+453
670
13*10=
130
589-167=
422
100:10=
10
645+455=
1000
135
999-666=
333
646:2=
323
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