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.


Find the LCD of the following pair of fractions: 23 and 58.


Write the common denominator of the fractions 12 and 13.


Given the following fractions, which of the following models represents the common denominator?

  • A
  • B
  • C
  • D
  • E


Nader says a common denominator of the fractions 12 and 14 is 2.

Is this correct?

  • AYes
  • BNo

Which of these is a common denominator of the fractions?

  • A2
  • B6
  • C4
  • D3
  • E1


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?


Jacob has drawn the model area of both 14 and 13 as shown.

Which of the following models expresses the common denominator of the two fractions?

  • A
  • B
  • C
  • D
  • E


Consider the two fractions 12 and 13.

What is the denominator of 12?

What is the denominator of 13?

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

  • A1
  • B2
  • C3
  • D6
  • E11


Select a common denominator of the fractions 12, 15, and 16.

  • A30
  • B2
  • C10
  • D5
  • E6


Which of the following pairs of fractions are equivalent to 23 and 14?

  • A67 and 47
  • B812 and 312
  • C212 and 112
  • D812 and 112
  • E212 and 312


Rewrite the fractions 23 and 14 as two fractions with a common denominator.

  • A212 and 112
  • B812 and 112
  • C812 and 312
  • D212 and 312
  • E67 and 47

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