Adding and Subtracting Fractions Unlike Denominators with Models

Cara and Marcus shared a candy bar. The models are shared to show the fraction of the candy bar each of them ate. What fraction of the candy bar did Cara and Marcus eat altogether?

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

• common numerator

• common denominator

• equivalent fraction

• mixed number

When adding or subtracting fractions, I NEVER add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

Find the sum.
5/9  +  2/9

• 5/9

• 2/9

• 7/9

• 7/18

• 1
• 3/6
• 1/2
• 2

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

• 8/10

• 7/10

• 8/15

• 11/15

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Once I have completed adding or subtracting fractions, I should always ____________ if possible.

• make equivalent fractions

• add again

• simplify

• multiply

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48