The fractions of unequally divided different two or more whole quantities are called unlike fractions.
A whole quantity can be divided into number of parts equally. If another whole quantity is divided into different number of equal parts, the two quantities are unlike in the point of view of different division. Therefore, the fractions which are considered from them are known as unlike fractions. The fraction of first whole quantity is unlike to the second fraction of second whole quantity and vice-versa.
The concept of unlike fractions is not limited to two whole quantities and they started with at least two whole quantities. So, the unlike fractions are the fractions which are considered from two or more unequally divided whole quantities.
Consider five rectangles and divide them into different number of equal parts.
, , and are the four fractions from this example. All four fractions contain different denominators, which mean , , and . It is due to the division of all whole rectangles into different number of equal parts.
So, if two or more fractions have different denominators, they are unlike fractions.