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Friday, June 14, 2013

Place Value and Reversibility


I had 64 apple I
Place Value
64-36 ?
60+4-30+6
60-30=30
30- 6=24+4=28 if you want to check your answer you go  28 +36=64

Reversibility
137-56 ?
56+___ =137
56+4=60+40=100+37=137  
4 + 40 + 37=81+56=137

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