Adding and Subtracting Fractions and Mixed Numbers with Unlike Denominators

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

Write the improper fraction as a mixed number

²²/₃

• 7 ²/₃

• 7 ¹/₃

• 7 ¹/₄

• 7 ³/₄

Write the mixed number as an improper fraction

5 ⁶/₇

Write the mixed number as an improper fraction

3 ⁴/₉

What is the sum of 2/3 and 1/5?

• 9/10

• 5/15

• 13/15

• 7/15

Add the fractions. Simplify if needed.

• 1

• 10 7/12
• 11 1/9
• 10 5/9
• 11 5/12

• 8/10

• 1 1/10

• 8/15

• 11/15

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

What is the sum of these fractions in lowest terms?

• 4/5

• 3/20

• 17/20

• 4/20