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-
+
x
100
2-1=
1
100
2+2=
4
100
2x2=
4
200
3-2=
1
200
4+4=
8
200
3x3=
9
300
10-5=
5
300
9+9=
18
300
3x2=
6
400
6-4=
2
400
9+8=
17
500
7-7=
0
500
9+3=
12