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The answer depends on "instead of WHAT?"
Rational fractions, percentages and decimal fractions are fractions: they are simply different ways of representing parts of a whole. So the choice cannot be between these. If the choice is between fractions and whole numbers, the answer is depends on the degree of accuracy required and the units in use. For example, if measuring your height, a whole number of centimetres would be appropriate but for metres, you would want fractional values (to hundredths of a metre).
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What is an everyday example where a fraction is impossible to use you have to use a decimal?
There is no such example. If you cannot use an exact fraction then there will not be an exact decimal that you can use instead. And, if you are using an approximate decimal, you could use an approximate fraction instead.
How to use benchmarks to estimate?
compare with random fraction to a benchmark fraction. to tell if a fraction is less or greater than another fraction.
How do you use a reciprical?
You use a reciprical in dividing fractions. 1st you write down the problem. then you flip over the 2nd fraction and multiply the 1st fraction with the second fraction, and there is your answer,
How do you use a calculator to change a fraction to a decimal fraction?
Divide the numerator by the denominator.
in order to convert unlike fraction to like fraction we use?
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