Add/Subtract Fractions and Mixed Numbers

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 compared or added together.

Front

How do you find a common denominator for 1/2, 1/3, and 1/4?

Back

The least common multiple (LCM) of the denominators (2, 3, and 4) is 12, which is the common denominator.

Front

What is the first step in adding fractions with different denominators?

Back

Find a common denominator for the fractions.

Front

How do you subtract fractions?

Back

To subtract fractions, make sure they have a common denominator, then subtract the numerators and keep the denominator the same.

Front

What is a mixed number?

Back

A mixed number is a whole number combined with a fraction, such as 2 1/4.

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

What is the sum of 3/4 and 2/8?

Back

1 (because 3/4 + 2/8 = 6/8 + 2/8 = 8/8 = 1).

Front

How do you add mixed numbers?

Back

Add the whole numbers together, then add the fractions, and if necessary, convert the result back to a mixed number.

Front

What is the difference between 2 1/4 and 7/8?

Back

1 3/8 (because 2 1/4 - 7/8 = 9/8 - 7/8 = 2/8 = 1/4, so 2 1/4 - 1/4 = 1 3/8).

Front

How do you add fractions with like denominators?

Back

Simply add the numerators and keep the denominator the same.