23 +5=
28
40-40=
0
100+300=
400
80-70=
10
40+40=
80
60-8=
52
150+50=
200
87
3X9=
27
47+5=
50-20=
30
540-510=
530
6X4=
24
47-2=
45
4X9=
36
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