We are moving our free videos to YouTube and retiring student functionality on 7/15. Learn more

Lesson plan

8. Solving two-step word problems using a variable representing an unknown quantity (FP)

teaches Common Core State Standards MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards 3.OA.D.8 http://corestandards.org/Math/Content/3/OA/D/8

8. Solving two-step word problems using a variable representing an unknown quantity (FP)

Lesson objective: Solve two-step word problems including a variable. 

This lesson helps to build procedural skill with solving two-step word problems including a variable. A variable is used here because it supports the representation of the unknown quantitiy. This work develops students' understanding that we can represent unknown quantities in equations using letters.

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they create logical representations of the problem at hand, including a variable for the unknown quantity.

Key vocabulary:

  • equation
  • unknown quantity
  • variable