# Lesson Worksheet: Common Denominators Mathematics • 4th Grade

In this worksheet, we will practice finding a common denominator of two proper fractions using models or listing multiples and using this to write both fractions over the same denominator.

Q1:

Find the LCD of the following pair of fractions: and .

Q2:

Write the common denominator of the fractions and .

Q3:

Given the following fractions, which of the following models represents the common denominator? • A • B • C • D • E Q4:

Nader says a common denominator of the fractions and is 2.

Is this correct?

• AYes
• BNo

Which of these is a common denominator of the fractions?

• A2
• B6
• C4
• D3
• E1

Q5:

Anthony divides a tart into 4 slices and Michael divides another tart of the same size into 5 slices. In how many slices can they now cut their tarts to get same-sized slices? Q6:

Jacob has drawn the model area of both and as shown. Which of the following models expresses the common denominator of the two fractions?

• A • B • C • D • E Q7:

Consider the two fractions and .

What is the denominator of ?

What is the denominator of ?

Which of the following is a common denominator for the two fractions?

• A1
• B2
• C3
• D6
• E11

Q8:

Select a common denominator of the fractions , , and .

• A30
• B2
• C10
• D5
• E6

Q9:

Which of the following pairs of fractions are equivalent to and ?

• A and
• B and
• C and
• D and
• E and

Q10:

Rewrite the fractions and as two fractions with a common denominator.

• A and
• B and
• C and
• D and
• E and