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addition
multiply
subtract
100
9+15??
24
100
6x1
6
100
9-4
5
200
4+9
13
200
9x2
18
200
17-8
9
300
=5+6
11
300
8x3
24
300
27-21
6
400
45+21
66
400
6x3
18
400
14-9
5
500
40+23
63
500
9x3
27
500
37-21
16