Lesson plan

6. Use addition and subtraction to solve a riddle (A)

teaches Common Core State Standards CCSS.Math.Content.2.OA.A.1 http://corestandards.org/Math/Content/2/OA/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
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Lesson objective: Solve a riddle using addition and subtraction strategies.

This lesson provides an opportunity for students to apply their knowledge and understanding of adding and subtracting two-digit numbers to a mathematical situation. Students are asked to use clue cards to determine how many exercises should be completed.

Key Concept students will use: 

  • Addition and subtraction can be used in many different ways.

Skills students will use:

  • adding and subtracting within 20 (e.g., Grade 2, Unit1)

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they determine how each clue card should be solved and choose a strategy to use to add or subtract.

Key vocabulary: 

  • add
  • arm circle
  • jumping jack
  • number line
  • sit ups
  • subtract