Topic Ten: Compose and Decompose Numbers 11 to 19

Desired Results

1. Makes sense of problems and persevere in solving them.
2. Reason abstractly and quantitatively.
3. Construct viable arguments and critique the reasoning of others.
4. Model with mathematics.
5. Use appropriate tools strategically.
6. Attend to precision.
7. Look for and make use of structure.
8. Look for and express regularity in repeated reasoning.
Established Goals:
  • K.NBT.1: Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.

Student I Can Statements:
  • I can make and take apart numbers from 11 to 19 by telling how many tens and ones are in the number.
  • I can show how many tens and ones in numbers from 11 to 19 by drawing a picture or writing a number sentence.
Big Ideas:

Number Uses, Classification, and Representation
Numbers can be used for different purposes, and numbers can be classified and represented in different ways.

The Base-Ten Numeration System
The base-ten numeration system is a scheme for recording numbers using digits 0-9, groups of ten, and place value.

Any number, measure, numerical expression, algebraic expression or equation can be represented in an infinite number of ways that have the same value.

Patterns, Relations, and Functions

Relationships can be described and generalizations made for mathematical situations, that have numbers or objects that repeat in predictable ways. For some relationships, mathematical expressions and equations can be used to describe how members of one set are related to members of a second set.

Practices, Processes, and Proficiencies
Mathematics content and practices can be applied to solve problems.
Essential Questions:
  • How can composing and decomposing numbers from 11 to 19 into ten ones and some further ones help you understand place value?
Students will know...
  • Numbers from 11-19 can be represented as the sum of 10 and some more.
  • The numbers 11-19 can be decomposed as the sum of ten and some ones.
  • Mathematicians look for patterns in math to help solve problems

How many more?

Students will be skilled at...
  • Using drawings and equations to make the numbers 11-19.
  • Composing and decomposing the numbers 11-19
  • Utilizing patterns to make and find parts of a number 11-19

Assessment Evidence

Performance Assessment:
Other Evidence:

Formative Assessment:

Learning Plan

Learning Activities:

10-1 Make 11, 12, and 13: Use drawings and equations to make the numbers 11, 12, and 13.

10-2 Make 14, 15, and 16: Make the numbers 14, 15, and 16

10-3 Make 17, 18, and 19: Make the numbers 17, 18, and 19

10-4 Find Parts of 11, 12, and 13: Find parts of 11, 12, and 13

10-5 Find Parts of 14, 15, and 16: Find parts of 14, 15, and 16

10-6 Find Parts of 17, 18, and 19: Find parts of 17, 18, and 19

10-7 Math Practices and Problem Solving: Look for and Use Structure: Use patterns to make and find the parts of numbers to 19

Problem of the month:

Counting & Cardinality


SmartBoard Activities/Games:

Dreambox Teacher Tools

Complements of 10