Lesson plan

Build on from a number to create 100 by using base ten blocks

teaches Common Core State Standards CCSS.Math.Content.2.NBT.A.1 http://corestandards.org/Math/Content/2/NBT/A/1
teaches Common Core State Standards CCSS.Math.Content.2.NBT.A.1a http://corestandards.org/Math/Content/2/NBT/A/1/a
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Big Ideas: The same number can be shown in many different ways. This lesson builds upon the previous lesson's work with building 100. Students are asked to model a number in multiple ways and then to choose a strategy to determine how many more they need to reach 100. They are then asked to model this number using base ten blocks. Being asked to make 100 in this way forces students to model the number in ways that they may not have previously done. This prepares students for the subsequent work of building three-digit numbers in various ways. Special Materials: Base Ten Blocks