Lesson plan

# 8. Composing a ten while adding ones on to a two-digit number (FP)

teaches Common Core State Standards CCSS.Math.Content.1.NBT.C.4 http://corestandards.org/Math/Content/1/NBT/C/4
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1

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Lesson objective: Add a two-digit number with a one-digit number, sometimes composing a ten.

This lesson helps to build fluency with composing a new ten. Cubes are used here because students will be able to see that a new ten is "complete." This work develops students' understanding that when adding a two-digit number with a one-digit number, sometimes it is neccessary to compose a new ten.

Students engage in Mathematical Practice 1 (Make Sense of Problems and Perservere in Solving Them) as they determine whether or not a new ten needs to be made while playing the game.

Key vocabulary:

• compose
• decompose
• ones
• tens

Special materials needed:

• 10-sided dice (see additional materials for template)
• Recording Sheet