Tuesday 19 November 2013

Adding Tens

30+40=70
20+30=50
80+10=90
10+40=50
50+30=80
60+20=80
50+10=60
10+60=70
30+20=50
80+20=100
80-40=40
90-30=60
50-10=40
30-20=10
20-10=10
70-40=30
80-10=70
70-20=50
90-50=40


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