Lesson 10 All Sorts of Denominators

    •  Let’s find common denominators.

Warm-up How Many Do You See: Fraction Sum

H​​​​ow many do you see? How do you see them?

Two diagrams, both squares with length and width, 1. Each partitioned into 3 rows of 4 of the same size rectangles. On left, 8 rectangles shaded. On right, 3 rectangles shaded.

Activity 1 Different Denominators

Find the value of each expression. Explain or show your thinking.

Activity 2 Multiply Denominators

Problem 1

Here is Lin’s strategy for finding the value of : “I know is a common denominator so I’ll use that.” Does Lin’s strategy for finding a common denominator work? Explain or show your thinking and then find the value of .

Problem 2

Find the value of each expression using a method that makes sense to you.

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Practice Problem

Problem 1

Find the value of each expression. Explain or show your reasoning.