Assessing Math Concepts - Changing Numbers

Assessing Math Concepts – Changing Numbers by Kathy Richardson helps teachers evaluate how children understand how numbers relate to one another and how quantities change when adding to or taking away from a set.

Assessing Math Concepts is a nine-part series of assessments that focus on the core mathematical concepts children need to understand in order to be successful in mathematics. The information gathered and organized through these assessments increases teachers’ awareness of the learning process and provides meaningful data for instructional decision-making.

Each book provides background information for administering and using the assessment tasks, tips for classroom observations, guidance for organizing student information, and suggestions for instruction. Blackline masters are included and can be reproduced for classroom use.

Changing Numbers helps teachers determine if children can change one quantity to another, describe how one number is related to another, identify how many to add or take away, and decide whether to add to or subtract from a number to reach a new total. It also assesses whether students can count on or remove extras to change a number.

• Part of the Assessing Math Concepts Series – Developed by Kathy Richardson to focus on core mathematical understanding.


• Focuses on Number Relationships – Evaluates how students understand and manipulate changing quantities.


• Supports Instructional Decision-Making – Provides insight into how children think about addition and subtraction relationships.


• Comprehensive Teacher Guidance – Includes background information, assessment directions, and instructional suggestions.


• Reproducible Blackline Masters – Ready-to-use materials for classroom assessment activities.


• Ideal for K–2 Classrooms – Perfect for formative assessment, intervention, and early math development.