- Step 1: Add fractions with same denominator Add or subtract the numerators and keep the same denominator if the fractions have the same denominator.
- TIP: The numerator is the number on the top, and the denominator the number on the bottom of the fraction.
- Step 2: Find a common denominator Find the lowest common denominator to both fractions if they have different denominators. For example, if you add 1/3 plus 3/8, the least common denominator is 24, since three times eight equals 24.
- TIP: The lowest common denominator is the smallest common multiple of both denominators.
- Step 3: Rewrite the fractions Rewrite the fractions, using the lowest common denominator. Multiply the numerator by the same number by which you multiplied the denominator.
- Step 4: Add or subtract the numerators Add or subtract the numerators and write the sum over the common denominator. The sum of 9/24 and 8/24 is 17/24. The difference is 1/24.
- Step 5: Reduce the fraction If necessary, reduce the fraction by dividing the numerator and denominator by the highest number you can.
- FACT: A fraction in which the numerator is larger than the denominator is called an improper fraction.
You Will Need
- Two fractions
- A pencil and paper