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Least Common Denominator - LCD

This page has printable worksheets on finding the Least Common Denominator, LCD, or Lowest Common Denominator.

Least Common Denominator - Worksheets

Two Fractions

This worksheet lays out the steps for finding least common denominators and then asks students to find the least common denominators for 6 pairs of fractions.
4th and 5th Grades
Common Core
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Calculate the least common denominator for each pair of fractions. This worksheet has 9 problems.
4th and 5th Grades
This file contains 30 task cards (4 per page). Each one has 2 fractions on it. Students find the LCD.
4th and 5th Grades

Three Fractions

This worksheet shows the rules for finding the least common denominator of three fractions. There are six questions for students to complete.
4th and 5th Grades
This file has 9 sets of 3 fractions. For each set, students must find the least common denominator.
4th and 5th Grades
This worksheet challenges students to find the lowest common denominator between groups of either 2 or 3 fractions.
4th and 5th Grades
See also:
Adding Fractions

Practice using LCD to add fractions with unlike denominators.

Subtracting Fractions

Subtract fractions and mixed numbers with unlike denominators.

Least Common Multiples (LCM)

Finding the Least Common Multiple (LCM) is very a similar skill to finding Least Common Denominator (LCD).

Sample Worksheet Images

Least Common Denominator Worksheets

Least Common Denominator - Printable Task Cards

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Common Core Alignment