Common Denominator and Rewrite Fractions

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

• 30

• 11

• 6

• 5

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction

• Rewrite the fractions in the simplest form. 

• Find a common denominator. 

• Make each fraction into an improper faction. 

What is the least common denominator of 1/2 and 3/7?

• 2

• 14

• 7

• 28

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

• 6

• 9

• 12

• 15

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Find a common denominator for the fractions $\frac{2}{3}$ 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 $\frac{7}{9}$ and $\frac{5}{6}$.

• 18

• 27

• 36

• 45

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

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