Basic Facts
1.30+40=70
2.20+30=50
3.80+10=90
4.10+40=50
5.50+30=80
6.60+20=40
7.50+10=60
8.10+60=70
9.30+20=50
10.80+20=100
1.80-40=40
2.90-30=60
3.50-10=40
4.30-20=10
5.20-10=10
6.70-40=30
7.50-30=20
8.80-10=70
9.70-20=50
10.90-50=40
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