# 6. Understanding that division always means the same thing, regardless of the strategy used (C)

teaches Common Core State Standards CCSS.Math.Content.5.NBT.B.6 http://corestandards.org/Math/Content/5/NBT/B/6
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Lesson objective: Understand that division always means the same thing.

Students bring prior knowledge of division from 4.NBT.B.6. This prior knowledge is extended to the meaning of division as students work to understand that mathematically, division always means the same thing. A conceptual challenge students may encounter is thinking that different strategies or division problems require different mathematical calculations.

The concept is developed through work with area models and partial quotients, which students compare to arrive at the conclusion that despite the strategy, division always means the same thing.

This work helps students deepen their understanding of divison because they are required to justify that, mathematically, division does not change even if the strategy or situation does.

Students engage in Mathematical Practice 3 (Construct a viable arguement) as they justify why the meaning of division does not change, even if the strategy or type of problem does.

Key vocabulary:

• area model
• dividend
• division
• divisor
• partial quotients
• quotient

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