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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