Lesson: Least Common Denominators Mathematics • 5th Grade

In this lesson, we will learn how to find the least common denominator of a pair of proper fractions with unlike denominators.

Lesson Plan

Students will be able to

recognize the relation between the least common denominator and the least common multiple,
identify the least common denominator of two fractions with unlike denominators,
rewrite a pair of fractions with unlike denominators using their least common denominator.

Q1:

Find the least common denominator of and .

Q2:

Find the least common denominator of the fractions and .

Q3:

Consider the two fractions and .

List the multiples of the denominator of .

Find the smallest number that is the same for the two denominators’ multiplies.

Find the least common denominator for the two fractions.