Reflection: Ways to Make 1 and 2- A Lesson on Decomposing - Section 2: Presentation of Lesson


This lesson aligns directly to the following standard.

K.OA.3 Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).


I taught decomposing numbers in the past, but I never did it in this way with the charts and the other visual representations of the numbers.  A few years ago I made charts like these each time I introduced a number, but we didn't use the number sentences since we hadn't learned addition yet.  I really like how combining these two ideas worked.  It really helped in this first lesson because the students felt successful as they came up with the visuals representations and then were very open and seemed to catch on quickly to the idea of the number sentences being additional ways to represent the numbers.

  Trying Something New
  Trying Something New
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Ways to Make 1 and 2- A Lesson on Decomposing

Unit 8: Addition
Lesson 8 of 21

Objective: Students will be able to decompose the numbers 1 and 2.

Big Idea: Students will learn what it means to represent a number in different ways and will begin to explore decomposing numbers.

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12 teachers like this lesson
Math, addition, decomposing numbers, Critical Area
  55 minutes
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