Adding and Subtracting Fractions with unlike Denominators

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, allowing them to be added or subtracted.

Front

How do you find a common denominator for two fractions?

Back

To find a common denominator, list the multiples of each denominator and identify the smallest multiple that appears in both lists.

Front

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

Back

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

Tags

CCSS.7.NS.A.1C

Front

What is the formula for adding two fractions?

Back

The formula for adding two fractions a/b and c/d is (a*d + b*c) / (b*d).

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

How do you convert fractions to have a common denominator?

Back

Multiply the numerator and denominator of each fraction by the necessary factor to make the denominators equal.

Front

What is the result of 1/4 + 3/8?

Back

The result is 5/8.

Tags

CCSS.7.NS.A.1C

Front

What is the least common multiple (LCM)?

Back

The least common multiple is the smallest multiple that two or more numbers share.

Front

How do you subtract fractions with unlike denominators?

Back

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

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the result of 1/5 + 5/6?

Back

The result is 31/30 or 1 1/30.

Tags

CCSS.7.NS.A.1C

Front

How do you simplify a fraction?

Back

To simplify a fraction, divide the numerator and denominator by their greatest common divisor (GCD).