Add and Subtract Mixed Fractions Word Problems Unlike Denominators

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

Is this a correct answer?

• Yes, the student correctly added.

• No, you cannot add unlike denominators

• No, 5 + 7 is not 12

• No, 2 + 3 is not 5

Jenna bought a spool of ribbon for her craft projects. It contained 5 3/4 meters of ribbon.  She used 3 2/5 meters of ribbon for a project.  How many meters of ribbon does Jenna have left?

• 2 7/20

• 1 8/20

• 4 3/20

• 3 7/20

John's full backpack weighs 5 1/2 pounds, and Tyrone's full backpack weighs 6 3/5 pounds. What is the total weight of both boys' backpacks?

• 12 4/10

• 10 2/10

• 11 1/10

• 12 1/10

A _________ is written as a whole number and a fraction.

• unlike denominators

• mixed number

• proper fraction

• common multiple

I know I must _________ if the question asks for the sum.

• add

• subtract

• divide

• multiply

I know I must __________ if the question asks for the difference.

• subtract

• add

• multiply

• divide

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators

What must you do first in order to add or subtract fractions with unlike denominators?

• add the numerators

• add the denominators

• find a common denominator

• find a common numerator