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Friday, June 14, 2013

Place Value and Reversibility


For Example:> I have $63.  I spend $18 to buy a game.  How much money left?

I use Place Value and Reversibility

Place Value
63 - 18= ?
60 - 10= 50 and 3 left
50 - 8=    42
42 + 3 = 45  
Answer =45
Reversibility
18 +__=63

18+2=20+40=60+3=63

2+40+3=45
Answer=45

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