When the top number (the numerator) of a fraction is greater than the bottom number (the denominator) then this is said to be an improper fraction.
The formal definition is that an improper fraction occurs when the absolute value of the numerator is greater than or equal to the absolute value of the denominator.
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You change them into improper or topheavy fractions.
It is a fraction in which the numerator or the denominator is 1.
You cannot. By definition, the absolute value of a mixed fraction is greater than one while, again by definition, the absolute value of a proper fraction is less than one.
A dissimilar fraction is a fraction where the denominator is not the same as the others .
If the GCF of the numerator and denominator is 1, the fraction is in its simplest form.