Educator

Subtracting Rational Numbers

• To subtract fractions with different denominators, write equivalent fractions for each fraction so that have the same denominator. Then subtract the numerators and keep the denominators the same. Remember to always check if you can simplify the fraction as your last step.
• Any common denominator can be used. If you are having trouble finding a common denominator you can multiply the denominators of the fractions with each other. However, using the Lowest Common Denominator may save steps and make simplifying the difference a lot easier.
• To subtract rational numbers that are in different forms, either make all the numbers fractions or make all the numbers decimals.