LCD/Add and Subtract Fractions with unlike Denominators

Front

What is the Least Common Multiple (LCM)?

Back

The LCM of two or more numbers is the smallest number that is a multiple of each of the numbers.

Front

How do you find the LCM of two numbers?

Back

List the multiples of each number and find the smallest multiple that they have in common.

Front

Find the LCM of 9 and 6.

Back

18

Front

What is the LCM of 7 and 8?

Back

56

Front

What is a mixed number?

Back

A mixed number is a whole number combined with a proper fraction.

Front

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

Back

Multiply the whole number by the denominator, add the numerator, and place that over the original denominator.

Front

Convert the mixed number 10 1/2 to an improper fraction.

Back

21/2

Front

What do you need to add or subtract fractions?

Back

You need a common denominator.

Front

What is a common denominator?

Back

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

Front

How do you find a common denominator for 1/4 and 1/6?

Back

The least common multiple of 4 and 6 is 12, so the common denominator is 12.