Illustrative Mathematics
Three Composing/Decomposing Problems
Practice composing and decomposing numbers in base-ten using three word problems. Each problem presents a different scenario requiring learners to explain their thinking, find the number of ones, and find out different ways to make a...
Illustrative Mathematics
Shake and Spill
Entertaining as well as educational, this math activity about decomposing numbers is bound to capture the engagement of young learners. Given a cup and five two-color counters, young mathematicians simply shake and spill the cup,...
Illustrative Mathematics
What’s Missing?
Now you see them, now you don't! This fun peek-a-boo activity engages young mathematicians in developing their ability to compose and decompose numbers. After being presented with a series of counters, children close their eyes while the...
Illustrative Mathematics
Pick Two
Learning to break apart numbers into smaller pairs is a critical step young mathematicians take as they develop their number sense. To practice this skill, children are provided with sets of three numbers and are asked to pick the two...
K20 LEARN
Decomposers—Fraction Style: Fractions
"What are fractions composed of?" is the essential question of a lesson designed to enhance understanding and strengthen the foundation of adding fractions. Mathematicians start by discussing what makes an equation true or false,...
Noyce Foundation
Apple Farm Field Trip
Monitor the growth of young mathematicians with a comprehensive addition and subtraction assessment. Using the context of a class field trip to an apple orchard, this series of four story problems allows children to demonstrate their...
New Mexico State University
Gate
Build numbers with place value to save the day. Pupils use the keyboard to control the digits in the hundredths through hundreds place to create target numbers to destroy shadows. As participants build the numbers, a number line shows...
Illustrative Mathematics
Overlapping Rectangle
Challenge young mathematicians' ability to compose and decompose shapes with this fun geometry puzzle. The goal is simple, locate all of the rectangles shown in a picture of three overlapping rectangles. Perform this activity as a whole...
National Security Agency
Fraction Fever
This unit on fractions allows for upper-aged elementary learners to explore ways to find the greatest common factor and least common multiple of two numbers. Ultimately, young mathematicians will be able to identify equivalent fractions,...
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Student Achievement Partners
Illustrative Mathematics: Three Composing/decomposing Problems [Pdf]
In this grade 2 lesson, young scholars use base ten blocks to compose and decompose numbers.
Study Pad
Splash Learn: Decompose Numbers (11 to 19) Into a Ten and a Few Ones
[Free Registration/Login Required] Using ten frames and number sentences, students will practice decomposing numbers into tens and ones.
Illustrative Mathematics
Illustrative Mathematics: 2.nbt Three Composing/decomposing Problems
In this lesson plan students use base ten blocks to explore place value.
Starfall
Starfall: Compose & Decompose Numbers
This learning game focuses on adding tens and ones to fill candy orders and deliver them.
K-5 Math Teaching Resources
K 5 Math Teaching Resources: Decompose a Factor [Pdf]
Students will learn how to determine the product by decomposing the factors.
Illustrative Mathematics
Illustrative Mathematics: What Makes a Teen Number?
Students will learn about teen numbers by understanding the base-ten structure of teen numbers. They will fill-in a 10-frame and a blank equation as they complete the activity. Worksheet included.
Illustrative Mathematics
Illustrative Mathematics: k.oa What's Missing?
Students will practice composing and decomposing numbers with this quick game. Show the student 6 counters. Ask the student to close his/her eyes. Hide some of the counters under a sheet of heavy paper. When the student opens his/her...
Other
The Math Learning Center: Pattern Shapes
Students use pattern shapes to explore geometry and fractions, creating their own designs, or filling in outlines. As they work with the shapes students explore geometric relationships, think about angles, investigate symmetry, and...