Adding and Subtracting Unlike Denominators

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

• Subtract the numerators

• Divide the denominators

• Find the least common multiple (LCM) of the denominators.

• Multiply the numerators together

How do you find a common denominator when adding fractions?

• Identify the least common multiple (LCM) of the denominators and use it as the common denominator.

• Multiply the denominators together to get a common denominator

• Add the numerators and denominators to find a common denominator

• Choose any random number as the common denominator

What is the process for subtracting fractions with unlike denominators?

• Multiply the denominators, subtract the numerators, simplify the result

• Add the numerators, keep the denominator the same

• Find a common denominator, subtract the numerators, keep the denominator the same.

• Divide the denominators, subtract the numerators, simplify the result

When subtracting fractions with unlike denominators, what do you do if the denominators are already the same?

• Subtract the numerators while keeping the denominator the same.

• Add the numerators instead of subtracting

• Change the denominators to be different

• Multiply the numerators and denominators

Solve the following addition problem: 1/3 + 1/4

• 5/7

• 2/5

• 3/8

• 7/12

Calculate the result of: 2/5 - 1/3

• 1/15

• 3/10

• 2/9

• 1/8

A recipe calls for 2/3 cup of flour and 1/4 cup of sugar. How much more flour is needed than sugar?

• 5/12 cup

• 1/5 cup

• 1/2 cup

• 1/3 cup

If you have 5/6 of a pizza and you eat 2/3 of it, how much is left?

• 2/6

• 3/6

• 1/6

• 1/3

In a race, John completed 3/4 of the track and Mary completed 5/6 of the track. Who completed a greater fraction of the track?

• Both completed the same fraction

• Mary

• John

• Neither completed a greater fraction

If you have 7/8 of a chocolate bar and you give away 2/5 of it, what fraction of the chocolate bar do you have left?

• 9/20

• 3/10

• 1/4

• 5/8