Build addition strategies using digits 1-10 with this two-page decomposing numbers worksheet.
This worksheet is best used as independent practice as part of your decomposing numbers addition lesson.
On each page, students will break down an addition sentence to show they understand how to find alternative digits that add up to the sum of ten.
An answer key is provided with this download.
Decomposing Numbers Worksheet Scaffolding and Extension Tips
In addition to individual student work time, this decomposing addition worksheet can be used as an activity for your:
Got fast finishers? Challenge students who have a grasp on the concept by providing them with larger numbers to practice the same method. Alternately, students who understand this concept might demonstrate their thinking by explaining how to solve 1-2 of these problems to the class.
Support struggling students by using smaller numbers or counters to help them better understand and visualize the numbers. Aids like posters, desk plates, and anchor charts are also helpful reference tools for students working with operations. You might also use this worksheet as an intervention assignment or with your guided math group.
A Variety of Ways to Prepare This Resource
Because this resource includes an answer sheet, we recommend you print one copy of the entire file. Then, make photocopies of the blank worksheet for students to complete.
To save paper, we suggest printing this 2-page worksheet double-sided.
You can also turn this teaching resource into a sustainable activity! Print a few copies on cardstock and slip them into dry-erase sleeves. Students can record their answers with a dry-erase marker, then erase and reuse.
Additionally, project the worksheet onto a screen and work through it as a class by having students record their answers in their math notebooks.
Before You Download
Use the dropdown icon on the Download button to choose between the PDF or Google Slides version of this resource. An answer key is also included with this download.
This resource was created by Saumirah McWoodson, a teacher in California and a Teach Starter Collaborator.
Don’t stop there! We’ve got more composing and decomposing numbers activities we know your students will love:
Common Core Curriculum alignment
Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 ...
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - ...
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Explain why addition and subtraction strategies work, using place value and the properties of operations.
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