Common Denominators Unlike Fractions

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

What is the least common denominator you could use to subtract 1/3 and 1/4?

• 3

• 4

• 24

• 12

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

Which of these numbers could NOT be a common denominator for these two fractions?
2/4   and   3/8

• 32

• 12

• 8

• 24

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

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{3}{4}$ and $rac{2}{3}$.

• 6

• 9

• 12

• 15

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.

• $\frac{2}{5}$

• $\frac{3}{7}$

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

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

• $rac{5}{6}$

• $rac{7}{8}$

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2