Any number can be put in fraction form
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a rational number
You cannot put a whole number into simplest form. A number has to a fraction to be simplified.
To convert an improper fraction to a mixed number, divide the denominator into the numerator. The answer is the whole number. Put any remainder over the original denominator to create the fraction part. Any fraction can be put into simplest form by finding the GCF of the numerator and denominator and dividing them both by it. If the GCF is 1, the fraction is in its simplest form.
To convert a mixed number to an improper fraction, multiply the denominator by the whole number, add that total to the numerator and put the whole thing over the original denominator. To put a fraction into its simplest form, find the GCF of the numerator and the denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form.
21/1 It is a whole number so it doesn't need to be put in simplest form.