Lesson plan

Solve one-step subtraction problems involving liquid volume by using multiple strategies

teaches Common Core State Standards CCSS.Math.Content.3.MD.A.2 http://corestandards.org/Math/Content/3/MD/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Big Ideas: We measure using units of the same size repeatedly. We can subtract units of liquid volume the same way we subtract other quantities. Liquid volume is the amount of liquid a container can hold. This lesson builds on what students know about liquid volume in metric units. They will solve problems that involve subtraction and use visual representation models in solutions. It is connected to the skill of fluently adding and subtracting within 1000 using strategies and algorithms. This lesson builds toward 4th grade skills with using all four operations to solve multi-step word problems involving liquid volumes and problems that require expressing measurements given in a larger unit in terms of a smaller unit. Vocabulary: milliliter, liter, difference, subtract, graduated cylinder Special Materials: None needed