Adding and Subtracting Fractions with Unlike Denominators

Front

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

Back

Find the least common denominator (LCD) for the fractions.

Tags

CCSS.7.NS.A.1C

Front

How do you find the least common denominator (LCD) of two fractions?

Back

Identify the least common multiple (LCM) of the denominators.

Front

What is the formula for adding fractions with unlike denominators?

Back

Convert each fraction to an equivalent fraction with the LCD, then add the numerators.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the formula for subtracting fractions with unlike denominators?

Back

Convert each fraction to an equivalent fraction with the LCD, then subtract the numerators.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

If you have the fractions 1/3 and 1/4, what is their least common denominator?

Back

The least common denominator is 12.

Front

What is the result of adding 1/3 and 1/4?

Back

The result is 7/12.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the result of subtracting 1/5 from 8/15?

Back

The result is 1/3.

Tags

CCSS.7.NS.A.1C

Front

When adding fractions, what do you do with the denominators?

Back

You keep the common denominator and add the numerators.

Tags

CCSS.4.NF.B.3D

CCSS.4.NF.B.3C

Front

When subtracting fractions, what do you do with the denominators?

Back

You keep the common denominator and subtract the numerators.

Tags

CCSS.4.NF.B.3D

CCSS.4.NF.B.3C

Front

What is an equivalent fraction?

Back

An equivalent fraction is a fraction that represents the same value as another fraction, even though it may have different numerators and denominators.

Tags

CCSS.4.NF.A.1

CCSS.3.NF.A.3B

CCSS.3.NF.A.3A