Lesson plan

2. Practice decomposing numbers to add and subtract (FP)

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.5 http://corestandards.org/Math/Content/2/NBT/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
Quick assign

You have saved this lesson plan!

Here's where you can access your saved items.

Content placeholder

or to view additional materials

You'll gain access to interventions, extensions, task implementation guides, and more for this lesson plan.

Lesson objective: Fluently solve addition and subtraction problems using an understanding of place value.

This lesson helps to build fluency with number decomposition. Decomposing numbers is used here because makes the numbers in the problem easier to work with. This work develops students' understanding that if you decompose a number before adding or subtracting it will make the problem easier to solve.

Students engage in Mathematical Practice 1 (Understand problems and perservere in solving them) as they decompose numbers before adding or subtracting them.

Key vocabulary:

  • decompose 
  • addend
  • total
  • difference