Lesson 15 Common Denominators to Compare
Let’s compare fractions by writing equivalent fractions with the same denominator.
Warm-up What Do You Know About …?
What do you know about 15 and 30?
Activity 1 Tricky Fractions?
Problem 1
In each pair of fractions, which fraction is greater? Explain or show your reasoning.
or or
Problem 2
Han says he can compare
Problem 3
Priya and Lin showed different ways for comparing
Priya:
Lin:
Activity 2 Use a Common Denominator, or Not
Problem 1
For each pair of fractions, write a pair of equivalent fractions with a common denominator.
and and and and
Problem 2
For each pair of fractions, decide which fraction is greater. Be prepared to explain your reasoning.
or or or or
Practice Problem
Problem 1
List these fractions from least to greatest.
Explain or show your reasoning.