Lowest Common Denominator

To have a common denominator means two or more fractions have the same number on the ___________ of the fraction line.

• top

• bottom

Tags

CCSS.4.NF.A.2

True or false: The fractions below have common denominators.

 $\frac{2}{5}\ \ \ \ and\ \ \ \ \ \frac{3}{5}$  

• True

• False

Tags

CCSS.4.NF.A.1

CCSS.5.NF.B.5B

True or false: The fractions below have common denominators.

 $\frac{6}{11}\ \ \ \ and\ \ \ \ \frac{6}{13}$  

• True

• False

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Find the lowest common denominator of the fractions:

 $\frac{1}{3}\ \ \ and\ \ \ \ \ \frac{1}{4}$  

•  $6:\ \ \ \frac{2}{6}\ \ and\ \ \frac{3}{6}$  

•  $12:\ \ \ \frac{4}{12}\ \ \ and\ \ \ \ \frac{3}{12}$  

•  $8:\ \ \ \frac{3}{8}\ \ \ and\ \ \ \ \frac{2}{8}$  

• There is no possible common denominator.

Tags

CCSS.4.NF.A.2

Find the lowest common denominator of the fractions:

 $\frac{3}{4}\ \ \ \ and\ \ \ \ \ \ \frac{5}{6}$  

•  $12:\ \ \ \ \frac{9}{12}\ \ \ and\ \ \ \ \ \frac{10}{12}$  

•  $16:\ \ \ \frac{12}{16}\ \ \ and\ \ \ \ \frac{15}{16}$  

Tags

CCSS.4.NF.A.2

Find the lowest common denominator of the fractions:

 $\frac{2}{7}\ \ \ and\ \ \ \ \frac{3}{14}$  

•  $28:\ \ \ \frac{8}{28}\ \ \ \ and\ \ \ \ \ \frac{6}{28}$  

•  $14:\ \ \ \ \ \frac{4}{14}\ \ \ \ and\ \ \ \ \ \frac{3}{14}$  

Tags

CCSS.4.NF.A.2

Find the lowest common denominator of the fractions:

 $\frac{1}{3}\ \ \ and\ \ \ \frac{5}{9}$  

•  $18:\ \ \ \ \frac{6}{18}\ \ \ and\ \ \ \ \frac{10}{18}$  

•  $9:\ \ \ \ \frac{3}{9}\ \ \ and\ \ \ \ \frac{5}{9}$  

Tags

CCSS.4.NF.A.2

Find the lowest common denominators for the fractions:

 $\frac{3}{8}\ \ \ and\ \ \ \ \frac{4}{5}$  

•  $25:\ \ \ \frac{9}{25}\ \ \ \ and\ \ \ \ \frac{20}{25}$  

•  $30:\ \ \ \ \frac{12}{30}\ \ \ and\ \ \ \ \frac{24}{30}$  

•  $40:\ \ \ \ \frac{15}{40}\ \ \ and\ \ \ \frac{32}{40}$  

• There is no common denominator possible.

Tags

CCSS.4.NF.A.2