Adding and Subtracting Fractions

Front

What is the least common multiple (LCM)?

Back

The least common multiple (LCM) of two or more numbers is the smallest multiple that is evenly divisible by each of the numbers.

Front

When do you use the LCM in adding or subtracting fractions?

Back

You use the LCM to find the common denominator when adding or subtracting fractions.

Front

How do you find the common denominator for fractions?

Back

To find the common denominator, determine the least common multiple (LCM) of the denominators of the fractions.

Front

What is the common denominator for 1/2 and 1/3?

Back

The common denominator for 1/2 and 1/3 is 6.

Front

How do you subtract fractions with different denominators?

Back

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

Front

What is the result of 2/4 - 1/3?

Back

The result of 2/4 - 1/3 is 1/12.

Front

How do you add fractions with different denominators?

Back

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

Front

What is the result of 3/4 + 1/2?

Back

The result of 3/4 + 1/2 is 1 1/4.

Front

What is a mixed number?

Back

A mixed number is a whole number combined with a proper fraction, such as 3 1/2.

Front

How do you convert a mixed number to an improper fraction?

Back

To convert a mixed number to an improper fraction, multiply the whole number by the denominator, add the numerator, and place the result over the original denominator.