Common Denominators Unlike Fractions

Which fraction is larger: $\frac{5}{6}$ or $\frac{7}{8}$? Use a common denominator to compare.

• $\frac{5}{6}$

• $\frac{7}{8}$

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

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

• 30

• 40

• 50

• 60

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

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

• $\frac{2}{5}$

• $\frac{3}{7}$

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Mathematical Equivalence

ON

Which fraction is smaller: $rac{3}{7}$ or $rac{4}{9}$? Use a common denominator to compare.

• $rac{3}{7}$

• $rac{4}{9}$

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

Which of these numbers could NOT be a common denominator for these two fractions?
1/6   and   1/4

• 12

• 18

• 24

• 36

Which of these numbers could NOT be a common denominator for these three fractions?
1/3   and 2/5   and   3/10

• 15

• 30

• 60

• 90

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 least common denominator of 1/7 and 3/6?

• 14

• 21

• 7

• 42