Fractions Common Denominators

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators

What number could be a common denominator for these two fractions?
1/5   and   5/6?

• 30

• 11

• 6

• 5

What is the least common denominator of 1/9 and 2/3?

• 6

• 3

• 9

• 21

What is the least common denominator of 2/6 and 7/8?

• 36

• 8

• 18

• 24

Find a common denominator for the fractions $\frac{2}{3}$ and $\frac{3}{4}$.

• 6

• 9

• 12

• 15

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Find a common denominator for the fractions $\frac{3}{4}$ and $\frac{2}{3}$.

• 6

• 9

• 12

• 15

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Find a common denominator for the fractions $rac{7}{9}$ and $rac{5}{6}$.

• 18

• 27

• 36

• 45

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Which fraction is larger: $\frac{3}{8}$ or $\frac{4}{9}$? Use a common denominator to compare.

• $\frac{3}{8}$

• $\frac{4}{9}$

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Find a common denominator for the fractions $\frac{5}{8}$ and $\frac{3}{10}$.

• 30

• 40

• 50

• 60

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

You must find the ​ (a)   before you can add or subtract fractions with unlike denominators.

• common denominator

• common numerator

• multiple

• simplified fraction