Adding and Subtracting Fractions with Unlike Denominators

Front

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

Back

Find a common denominator for the fractions.

Tags

CCSS.7.NS.A.1C

Front

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

Back

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

Front

What is the formula for adding two fractions?

Back

To add two fractions, a/b + c/d = (a*d + b*c) / (b*d).

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the formula for subtracting two fractions?

Back

To subtract two fractions, a/b - c/d = (a*d - b*c) / (b*d).

Tags

CCSS.7.NS.A.1C

Front

How do you simplify a fraction?

Back

Divide the numerator and the denominator by their greatest common divisor (GCD).

Front

What is the GCD of 20 and 4?

Back

The GCD of 20 and 4 is 4.

Front

What is the mixed number representation of 10/3?

Back

10/3 can be expressed as 3 1/3.

Front

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

Back

Divide the numerator by the denominator; the quotient is the whole number, and the remainder is the new numerator.

Front

What is the result of 1/9 + 2/27?

Back

The result is 5/27.

Tags

CCSS.7.NS.A.1C

Front

What is the result of 1/3 - 1/8?

Back

The result is 5/24.

Tags

CCSS.7.NS.A.1C