Common Denominators

Front

What is a common denominator?

Back

A common denominator is a number that can be used as a denominator for two or more fractions, allowing them to be added or subtracted.

Front

Why can't you add fractions with unlike denominators?

Back

You cannot add fractions with unlike denominators because they represent different parts of a whole, making it impossible to combine them without a common denominator.

Front

What do you need to find when adding fractions?

Back

You need to find a common denominator.

Front

What is the least common denominator (LCD)?

Back

The least common denominator (LCD) is the smallest number that can be used as a common denominator for two or more fractions.

Front

Find the least common denominator of 1/3 and 1/4.

Back

The least common denominator is 12.

Front

Which of these is NOT a common denominator for 1/3, 2/5, and 3/10: 15, 30, 60, 90?

Back

15 is NOT a common denominator.

Front

What is the least common denominator of 1/7 and 3/6?

Back

The least common denominator is 42.

Front

How do you find a common denominator for two fractions?

Back

To find a common denominator, list the multiples of each denominator and find the smallest multiple they share.

Front

If the denominators are 4 and 6, what is a common denominator?

Back

A common denominator is 12.

Front

What happens if you add 1/2 and 1/3 without a common denominator?

Back

You cannot add them directly; you must first find a common denominator.