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Lesson plan

Doubles +/-1 and +/-2 (Mini Lesson)

teaches Common Core State Standards 2.OA.B.2 http://corestandards.org/Math/Content/2/OA/B/2

Doubles +/-1 and +/-2 (Mini Lesson)

Lesson objective: Students will apply the doubles +/- 1 and doubles +/-2 strategies to addition problems.

This optional mini lesson builds on work students have completed in Lesson 1 of this unit by introducing a new strategy for addition. Students will use what they know about doubles to add expressions that are doubles plus or minus one or two. 

The doubles strategy for addition is developed in this lesson through visual models and discussion. You may wish to provide ten frames and counters for students to use. A blank ten frames template has been provided for this purpose in the Additional Materials section. If needed, one way to scaffold this use of these tools is to have students place the first addend of the expression on one ten frame and the second addend of the expression on another ten frame. Ask students to identify what's different about the two frames. This helps to highlight the doubles +/- 1 or doubles +/- 2 feature of the expression. You may also choose to model this for the class before distributing materials for students to use on their own.

There are additional doubles lessons found in the Grade 1 materials, linked in Additional Materials. You might want to revisit those if students struggle or are new to doubles.

Students will continue to work with the doubles strategy in the remainder of Unit 1, as well as throughout their addition work in Grade 2, especially as they work towards fluency with addition within 20 (2.OA.2). This strategy helps students in developing a deep understanding of the number system because it teaches students another way to flexibly compose and decompose numbers.

Students will engage in Math Practice 8 (Look for and express regularity in repeated reasoning) as they engage in considering the regularity in decomposing numbers to make easier problems using doubles.

Key vocabulary:

  • doubles
  • ten frame
  • number bonds

Special materials needed:

  • ten frames
  • cubes and/or counters

About mini lessons:

  • Mini lessons are short lessons, often focused on a key strategy, that are intended to complement instruction for certain key concepts. 
  • Mini lessons are designed to take between 15 and 20 minutes and can be used flexibly. While mini lessons are suggested in the sequence of a unit, they can be used at the teacher's discretion depending on the needs that arise from students.
  • For example, teachers might use a mini lesson immediately after a conceptual lesson to solidify understanding of a new idea or to give students a new way to think about the concept. Teachers might also use a mini lesson as part of a number-talk or warm-up routine prior to beginning the day's instruction. In other classrooms, teachers may decide to use the mini lesson for certain small groups while other students engage in practice or center work.