# Constructing Commons - Finding Common Denominators

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PDF | 8 pages|Grades: 4 - 6

A teacher-facilitated activity focused on understanding the meaning and why of “common” denominators and changing fractions into the common denominator.

Students use concrete and pictorial models to find common denominators and change fractions into a common denominator. This allows them to be able to rely on understanding the meaning of equivalent fractions in changing a fraction’s denominator rather than relying on processes that can easily become confused.

8 problems including models

Use during guided maths, as a teacher-facilitated activity with the whole class, during tutoring or intervention, with small groups, or in centers.

This activity includes clear and concise teacher directions, an example with questioning, an answer key, and conversation starters that give students what they need to have meaningful academic discussions.

#### Common Core Curriculum alignment

• CCSS.MATH.CONTENT.4.NF.A.1

Explain why a fraction a/b is equivalent to a fraction (n × a)/(n × b) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size. Use this principle to ...

• CCSS.MATH.CONTENT.5.NF.A.1

Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5...

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