



 
Fay, We don't always! But when we do it might be because... *decimals are easier to compare: is 8/13 bigger than 14/23? *decimals are easy to approximate; if you only need to be within 1% for a practical purpose you just round. You can do this with fractions but it's trickier. *decimals are easy to add (fractions are often easier to multiply.) Good Hunting!
 


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