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How can I quickly exercise this Numerical [www.kidsmathblog.com/estimating-fractions estimating fractions] properly? Absolutely suit regarding estimating fractions with all the following:

16/4 x 60/5 � 12/4 x 48/12 + 4/10 x 20/4 - 3 = ?

You really want a calculation, not an estimation; an estimation is surely an *approximate* calculation to be as close to possible to the real value (an easy example will be a decimal representation of the irrational number). In this instance, we are a perfect value.

now, I'll rewrite your expression so there is no ambiguity: (16/4 x 60/5) / (12/4 x 48/12) + (4/10 x 20/4) - 3

first, we now have (16/4) x (60/5) = 16 x 60 /(4*5) = 16 * (60/20) = 16 * 3 = 48 as well as the denominator: (12/4) x (48/12) = 3 x 4 = 12 so that: (16/4 x 60/5) / (12/4 x 48/12) = 48/12 = 4

now (4/10) x (20/4) = (4/4)x(20/10) = 1 x 2 = 2

notice how numerators and denominators are manipulated in the products, in order that simplifications can be produced.

therefore we accumulate: (16/4 x 60/5) / (12/4 x 48/12) + (4/10 x 20/4) - 3 = 4 + 2 - 3 = 3