Decompose Numbers (Kindergarten)



Videos and songs to help Kindergarten kids learn to 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).

For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.

Common Core Standards: K.OA.3 and K.OA.4

Suggested Learning Target

  • I can decompose (break apart) numbers to 10 using objects or drawings.
  • I can record the answer using a drawing or equation.
  • I know how to separate a number into two parts and understand that there is a relationship between the sum of the parts and the whole
  • I know that there are a variety of combinations that represent a given number
  • I can begin with the whole when decomposing numbers into pairs. I know that when writing an equation to represent the decomposition of a number, the values on each side of the equal sign are the same (e.g., 7 = 2 + 5)

  • I can determine the number to add a given number 1-9 to make 10, and show the answer with a drawing or equation
  • I can apply decomposition knowledge and relationship between addition and subtraction to determine the sum or differences of various problems

Related Topics:
More Lessons for Kindergarten

Common Core for Kindergarten

Quick Images: Visualizing Number Combinations
Grade K / Math / Composition
CCSS: Math.K.OA.A.1 Math.K.OA.A.3
Lesson Objective
Use quick images to identify combinations of 8


Number Bonds within Ten

We can decompose numbers using a technique called Number Bonds

Decomposing Numbers using Number Bonds (Singapore Math)
Number bonds and how they can be used to make addition and subtraction number sentences. Using the Singapore math heuristic of number bonds, students can represent both of these operations and meet Common Core standard K.OA.1.



Number Bonds Within 10
I can decompose (break apart) numbers to 10 using objects or drawings.
I can record the answer using a drawing or equation.





Addition Equations Within 10
I can record the answer using a drawing or equation.



What makes 10?

Number Bonds of 10
I can determine the number to add a given number 1-9 to make 10, and show the answer with a drawing or equation





Introduction to decomposing numbers to ten



What Makes 10?
Making 10 with Addition and Subtraction





What makes 10?
Basic number facts to 10 using the tens frame



Songs to make 10

They're Friends of Ten
Music video all about the Friends of Ten or number bonds to ten to the catchy music of Lou Bager's Mumbo No.5 . Once children have a grasp of the number bonds to ten, they can use their gained knowledge as a strategy for addition and subtraction.



Partners to 10
A song to help young children learn the combinations of numbers that add up to 10. For example, 1 + 9 = 10, 2 + 8 = 10, 3 + 7 = 10, 4 + 6 = 10, 5 + 5 = 10







Number bonds are pairs of friends - number bonds to 10 song
Learn your number bonds to ten in an easy and fun way. Get the kids to just sing along to the numbers first then learn the rest of the words.
9 and 1 Number bonds are fun
8 and 2 Maths is good for you
7 and 3 Sing along with me
6 and 4 Let's sing some more
5 and 5 Make me feel alive



The friends of 10
A song and animation to help children learn and remember the addition facts of 10.








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