10+10=?
=20
10-5=?
=5
2x1=?
=2
12+12=?
=24
24-12=?
=12
3x1=?
=3
20+20=?
=40
20-20=?
2x5=?
=10
90+20=?
=110
120-20=?
=100
1x1=?
=1
45+3=?
=48
500-100=?
=400
3x3=?
=9
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