To find the sum or difference of fractions, first find the lowest common denominator (LCD) of each fractions. Once you find the LCD, add or subtract the numerators to discover your answer.Continue Reading
When the fractions have the same denominator, or bottom number, continue on to solve the problem. When the fractions have different denominators, convert them to equivalent fractions using the LCD rule. To find the LCD, calculate the least common multiple of all of the denominators. For example, you are given two-thirds and four-sixths. The least common multiple is six. Convert two-thirds to an equivalent fraction by multiplying the numerator and the denominator by two. The equivalent fraction is four-sixths.
Perform addition to find the sum of two or more fractions. When the denominators are the same, add the numerators, or top numbers, to calculate the answer. The denominator doesn't change. For example, two-thirds plus four-thirds equals six-thirds.
Subtract the smaller fraction from the larger fraction to calculate the difference. When the denominators are the same, subtract the smallest numerator from the largest. Write the answer over the original denominator for the correct answer. For example, five-eighths minus three-eighths equals two-eighths.
Equivalent fractions are fractions that have the same numerical value. For example, 1/2 and 2/4 are equivalent fractions, as they are both equal to 0.5.Full Answer >
Two fractions can be compared to determine which of them is greater by cross-multiplication. In cross multiplication, the numerator of each fraction is multiplied by the denominator of the opposing fraction. Whichever value is bigger corresponds to the larger fraction.Full Answer >
To reduce or simplify fractions, look for common factors in the numerator (the term on top) and the denominator (the term on the bottom). Divide both terms by the greatest common factor to reduce the fraction to its lowest terms.Full Answer >
To multiply mixed fractions, convert them into improper fractions and then multiply the numerators and denominators. Simplify the resulting fraction by dividing the numerator and denominator by a common factor.Full Answer >