Definition of Unlike Fraction:
Unlike fractions are fractions that have different numerators. In other words, the numbers above the fraction line are not the same in unlike fractions.

Explanation:
- Fractions: Fractions represent a part of a whole. They consist of a numerator (the number above the fraction line) and a denominator (the number below the fraction line).
- Unlike Fractions: When comparing fractions, if the numerators are different, the fractions are considered unlike. For example, 2/5 and 3/7 are unlike fractions because their numerators (2 and 3) are not the same.
- Importance: Understanding unlike fractions is essential in various mathematical operations such as addition, subtraction, multiplication, and division of fractions.
- Mathematical Operations: When working with unlike fractions, you first need to find a common denominator before performing operations. This involves finding a common multiple of the denominators so that the fractions can be added, subtracted, multiplied, or divided accurately.
- Example: If you want to add 1/4 and 2/3, you need to first find a common denominator. In this case, the least common multiple of 4 and 3 is 12. Therefore, you convert 1/4 to 3/12 and 2/3 to 8/12. Then, you can add them as 3/12 + 8/12 = 11/12.
Understanding unlike fractions is crucial in mastering fraction arithmetic and solving various mathematical problems efficiently.