How can you tell that a fraction is a unit fraction?

The definition of the unit fraction is given below.

Answer: A unit fraction is any fraction with 1 as its numerator (top number), and a whole number in the denominator (bottom number). 

Let us look at some examples of unit fractions.

Explanation:

1/2, 1/4, and 1/56 are unit fractions.

While 5/3, 5/8, and -2/9 are NOT unit fractions.

Hence, a unit fraction is any fraction with 1 as its numerator and a whole number in the denominator.