Find a Common Denominator

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

What would be the common denominator for adding 1/2 + 3/4?

• 6

• 4

• 9

• 2

What step should you do first when adding fractions with unlike denominators?

• Just add the denominators together

• Find a common denominator

• Add the numerators together first

• Chang each numerator to be the same

What is the least common denominator of 1/4 and 1/3?

• 4

• 3

• 12

• 8

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

• common denominator

• common numerator

• multiple

• simplified fraction

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 of the following would be the new fractions for finding common denominators for 3/4 and 2/6?

• 9/12 and 4/12

• 6/8 and 4/12

• 9/12 and 6/18

• 2/12 and 6/12

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

• common denominator

• common numerator

• multiple

• simplified fraction

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

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