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Friday

Li - To mentally add and subtract decimals 

Challenge 

 

Here are four calculations.
Which one is the easiest to answer?
Which one is the trickiest to answer?
Explain your choice of order.


0.45 − 0.3 =
0.45 − 0.15 =
0.45 − 0.23 =
0.45 − 0.18 =

 


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