Thursday, 12 May 2016

Prove It

Can I use my basic facts to add and subtract tens?
15 +56=71
10+50=60
5+6= 11
11+60=71

106+78=186
100+70=170
8+6=16
170+16=186

19+100=119
10+100=110
9+0=9
9+110=119

61-33=28
60-30=30
3-1=2
2-30=28

80-30=50
8- 5=5
80-30=50

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