Free Printable Lowest Common Denominator

1.

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

a)

top

b)

bottom

2.

True or false: The fractions below have common denominators.

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

a)

True

b)

False

3.

True or false: The fractions below have common denominators.

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

a)

True

b)

False

4.

Find the lowest common denominator of the fractions:

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

a)

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

b)

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

c)

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

d)

There is no possible common denominator.

5.

Find the lowest common denominator of the fractions:

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

a)

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

b)

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

6.

Find the lowest common denominator of the fractions:

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

a)

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

b)

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

7.

Find the lowest common denominator of the fractions:

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

a)

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

b)

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

8.

Find the lowest common denominators for the fractions:

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

a)

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

b)

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

c)

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

d)

There is no common denominator possible.

Lowest Common Denominator

Total questions: 8

Worksheet time: 8mins

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