Decimals are more commonly used.
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Yes.
Yes.Yes.Yes.Yes.
any integer (the counting numbers)
You can always convert a fraction to a decimal. For some fractions, you'll get terminating decimals. For example, 1/8 = 0.125. For other fractions, you get repeating decimals, such as 1/7 = 0.142857 142857 142857...To convert the fraction to a decimal, just divide the numerator by the denominator, for example on a calculator.
Both are ways of representing numbers. Fractions can only be used for rational numbers whereas a decimal representation can also be used for irrational numbers. However, all fractions are exact values whereas any fractions whose denominators has a factor other than 2 or 5, and all irrationals can only be represented by decimals that are infinitely long. Since an infinitely long number cannot be written, the decimals for these numbers are approximations.