Decomposing Numbers
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Subject Area: Mathematics (B.E.S.T.) | Grade Level: K
Lesson Length: 15 minutes or less
Keywords/Tags: Decomposing Numbers
Lesson Description: Decomposing numbers is a complex topic for kindergarten students to grasp. The concept is broken down in an engaging and kid friendly way for students to be successful.

  • MA.K.AR.1.1 For any number from 1 to 9, find the number that makes 10 when added to the given number.
  • MA.K.AR.1.2 Given a number from 0 to 10, find the different ways it can be represented as the sum of two numbers.
  • MA.K.AR.1.3 Solve addition and subtraction real-world problems using objects, drawings or equations to represent the problem.
  • MA.K.AR.2.1 Explain why addition or subtraction equations are true using objects or drawings.
  • MA.K.DP.1.1 Collect and sort objects into categories and compare the categories by counting the objects in each category. Report the results verbally, with a written numeral or with drawings.
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Video : Composing and Decomposing Numbers
Instructions: Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.")
Description: Learn how to compose and decompose numbers with number bonds.
Quiz : Number Bonds
Instructions: Please complete this quiz by choosing the correct answer for each question. You can take this quiz as many times needed.
Question #1
A number bond shows the parts and whole of an equation.
Question #2

2+3=5

Question #3
In an addition equation, the whole number should be larger than the parts.
Question #4
In the equation 5+7=12, 12 is a part.
Question #5
Draw a number bond to show the equation 5+6=11
Question #6
Draw a number bond to show the equation 7+3=10
Question #7
Draw a number bond to show the equation 7+1=8
Description: Fill in the missing number or identify which is the parts and the whole.
Resources : Additional Resources for Decomposing Numbers
Instructions: Please see additional external resources below. Feel free visit each link to learn more about this lesson.
Scratch Garden-Number Bonds

Jack Hartman- Number Bonds

What are number bonds?

Forum : All about Number Bonds: Questions
Instructions: This discussion forum will have questions for students to respond. Read the posted questions, and respond to each. Students are responsible for posting one initial and and two peer responses for each topic.
Why Number Bonds?
Tell me why number bonds are an effective way to represent an equation.
Description: Questions relating to number bonds and representing equations.
Assignment : Number Bond Worksheet

Create a number bond for the following equations:

 

1. 2+5=7

2. 4+6=10

3. 2+3=5

4. 0+1=1

5. 8+1=9