Worksheet: Common Denominators

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:

Which of the following sets of fractions has an LCD of 60 and is ordered from least to greatest?

  • A724,15,13
  • B712,13,15
  • C15,13,712
  • D13,15,712
  • E15,724,13

Q2:

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

Q3:

Find the LCD of the following pair of fractions: 23 and 29.

Q4:

Find the LCD of the following pair of fractions: 49 and 511.

Q5:

Find the LCD of the following pair of fractions: 12 and 13.

Q6:

Find the LCD of the following pair of fractions: 35 and 611.

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