you use the number you want to express as the fraction as the numerator and the other number is the denominator. an example is, "express 1 as a fraction of 4"
you would write it as 1/4
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There is no whole number in a fraction. A fraction is a little number on top and another little number on the bottom. The numerator is the little number on top.
May be a whole number, a mixed number, or another fraction, depending on what the original two fractions are.
The recommended method in schools is to write the whole number as a rational fraction with denominator 1, and then proceed as you would for subtracting one fraction from another fraction.
If you mean 2/4 then as a fraction it is equivalent to 1/2 in its simplest form
Any real number can be the denominator in a fraction. A fraction is a way of expressing one number (the numerator, the "top" number in a fraction) by another (the denominator, "bottom number.") So it is possible to have a denominator of 100.