Math Fractions with Common Denominators

What number could be a common denominator for these two fractions?
2/3   and   3/4

• 3

• 4

• 7

• 12

What number could be a common denominator for these two fractions?
3/10   and   1/5

• 5

• 10

• 15

• These numbers do not have a common denominator

2/5 + 3/10

• 7/10

• 5/10

• 1/2

• 5/15

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

• common numerator

• common denominator

• equivalent fraction

• mixed number

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

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 smaller: $rac{1}{3}$ or $rac{2}{5}$? Use a common denominator to compare.

• $rac{1}{3}$

• $rac{2}{5}$

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Which fraction is larger: $rac{2}{5}$ or $rac{3}{7}$? Use a common denominator to compare.

• $rac{2}{5}$

• $rac{3}{7}$

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Find a common denominator for the fractions $rac{1}{4}$ and $rac{2}{5}$.

• 10

• 15

• 20

• 25

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2