Add and Subtract Fractions with Unlike Denominators

Front

What is a fraction?

Back

A fraction represents a part of a whole and consists of a numerator (top number) and a denominator (bottom number).

Front

What does it mean to have unlike denominators?

Back

Unlike denominators are when the bottom numbers of two or more fractions are different.

Front

How do you add fractions with unlike denominators?

Back

To add fractions with unlike denominators, first find a common denominator, convert the fractions, and then add the numerators.

Front

What is a common denominator?

Back

A common denominator is a number that is a multiple of the denominators of two or more fractions.

Front

How do you find the least common denominator (LCD)?

Back

The least common denominator (LCD) is the smallest multiple that two or more denominators share.

Front

What is the first step in subtracting fractions with unlike denominators?

Back

The first step is to find a common denominator for the fractions.

Front

If you have 1/3 and 1/4, what is the common denominator?

Back

The common denominator for 1/3 and 1/4 is 12.

Front

How do you convert 1/3 to have a denominator of 12?

Back

Multiply the numerator and denominator of 1/3 by 4 to get 4/12.

Front

What is the result of adding 1/3 and 1/4?

Back

1/3 + 1/4 = 4/12 + 3/12 = 7/12.

Front

How do you subtract 2/5 from 3/10?

Back

First, find a common denominator (10), convert 2/5 to 4/10, then subtract: 3/10 - 4/10 = -1/10.