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x
+
_
100
2x2=
4
100
2+4
=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+ 7
=52
400
456-342
=114
500
6x10
=60
500
100+2
=200
500
600-200
=400