When the numerator is equal to or a multiple of the denominator.
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A whole number to an improper fraction:First lets define an improper fraction. An improper fraction is a fraction at which the numerator (top) is greater than the denominator (bottom).To change a whole number to an improper fraction you simply add a one to the bottom of your whole number. For example, 5 would be 5/1 in improper fraction form. 6 would be 6/1 an so forth.
Whole number
You convert the mixed numeral into an improper fraction. Now subtract the improper fraction from the whole number by putting the whole number over 1.
An improper fraction
multiply the denominator by the whole number then add the numerator and you have an improper fraction