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x
+
_
100
2x2=
4
100
2+4 3+3=
6
100
5-3=
2
200
5x6=
=30
200
5+2=
7
200
3-2=
1
300
3x9=
27
300
6+5=
11
300
4-2=
2
400
4x8=
32
400
45+ 77=
23
400
456-342=
114
500
6x10
=60
500
100+2=
102
500
600-200=
400