Adding and Subtracting Like Fractions with Unlike Denominators

What is the process of making two fractions with unlike denominators able to be added or subtracted called?

• Finding the least common multiple or least common denominator

• Addition

• Multiplication

• Reverse multiplication

What is the first step of adding or subtracting two fractions?

• Checking if the numerators are the same

• Checking if the denominators are the same or different

• Checking that the fractions are equal

• Adding or subtracting

When adding and subtracting fractions, what needs to be the same?

• the numerator

• the denominator

• nothing

• everything

When adding or subtracting fractions with unlike denominators, what is the first step?

• Add the numerators

• Add the denominators

• Find a common denominator

What is the sum of these fractions in lowest terms?

• 4/5

• 3/20

• 17/20

• 4/20

Adding & Subtracting Fractions with

UNLIKE Denominators

• I'm ready to try

• Let's do this!

• I'm not sure about these.

How can you find a common denominator?

• Add the denominators together

• Pick your favorite number

• Find a common multiple for the two denominators

What is ALWAYS required when adding/subtracting fractions?

• The same numerators.

• The same denominators.

• Equivalent fractions.

Find Lowest Common Denominator & solve
8     4/5    +    9    1/10  =

• 18   5/15

• 17   5/10

• 17   9/20

• 17   9/10

Subtraction:
Find Lowest Common Denominator & solve
8    5/7    -    7    2/3 = 

•     3/4

•    1/21

•      1/24 

•     3/24