Add/Subtract Fractions with unlike Denominators

Front

What is a fraction?

Back

A fraction represents a part of a whole and consists of a numerator (top number) and a denominator (bottom number).

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

Front

What does it mean to have unlike denominators?

Back

Unlike denominators are when the bottom numbers of two or more fractions are different.

Tags

CCSS.4.NF.B.3A

Front

How do you add fractions with unlike denominators?

Back

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

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the least common multiple (LCM)?

Back

The least common multiple is the smallest number that is a multiple of two or more numbers.

Front

What is the first step in adding 1/4 and 1/6?

Back

Find the least common multiple of the denominators (4 and 6), which is 12.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

How do you convert 1/4 to have a denominator of 12?

Back

Multiply the numerator and denominator by 3: (1 x 3)/(4 x 3) = 3/12.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

How do you convert 1/6 to have a denominator of 12?

Back

Multiply the numerator and denominator by 2: (1 x 2)/(6 x 2) = 2/12.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

What is the sum of 3/12 and 2/12?

Back

The sum is (3 + 2)/12 = 5/12.

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Front

What is the process to subtract fractions with unlike denominators?

Back

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 an example of adding fractions with unlike denominators?

Back

Example: 1/3 + 1/4. Find LCM (12), convert to 4/12 + 3/12 = 7/12.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2