Find a Common Denominator

What is the least common denominator of 2/6 and 7/8?

• 36

• 8

• 18

• 24

Find the least common denominator of 1/5 and 2/10.

• 10

• 5

• 50

• 15

Find the least common denominator of 1/6 and 5/12.

• 18

• 12

• 6

• 1

Which of these numbers could NOT be a common denominator for 1/6 and 5/18?

• 6

• 18

• 36

• 108

Find the least common denominator of 3/4 and 3/8.

• 3

• 4

• 8

• 12

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

Using the chart, find the LCD of 3 and 2.

• 2

• 4

• 8

• 12

Use the multiplication sentences in the image to find the 2 fractions with the LCD from the original fractions: \(\frac{1}{2}+\frac{1}{4}\)

Reorder the following steps to find the LCD when adding 2 fractions that have unlike denominators.

• Find the LCM

• Write the multiplication sentences for the LCM.

• Multiply the numerator & denominator by the same factor.

• Write 2 new fractions that have the same denominator.