Up next in Basic Math Skills (15 videos)
Do you and arithmetic add up to disaster? Sharpen your basic bath skills with the lessons in this Howcast video series.
You Will Need
Add fractions with the same denominator
Add fractions that have the same bottom number, or denominator. Add the top numbers, or numerators, together, and keep the denominator the same.
Find common denominator
When you are adding fractions with different denominators, find a denominator that is common to both fractions. To change a denominator without changing the value of the fraction, multiply the top and the bottom numbers by the same number.
Add the numerators together, and keep the denominators the same. For example, add 9/12 and 5/12 by adding the numerators – nine and five – to get 14/12.
Simplify the solution by dividing the numerator and denominator by the same number to make the lowest possible fraction. For example, the fraction 14/12 can be simplified by dividing both numbers by two for the answer 7/6, which can also be written as 1 1/6.