Good at Math® First Grade Unit 3: Addition and Subtraction Strategies

Good at Math® First Grade is a 12 unit 1st Grade math curriculum for classroom and homeschool learning environments. Each unit comes with detailed daily lesson plans, posters, teaching tools, anchor chart elements, games, center materials, independent practice, no prep printables, end of unit assessment, a Mini PBL unit, and bonus practice materials for additional skill exposure. The detailed lesson plans include a title, postable lesson goal, lesson materials list, warm up fluency practice that spirals, direct teaching, group/tandem practice that includes hands on and movement based skill practice, individual/partner/small group exploration, center activities, individual practice, and national first grade standard alignment. Good at Math® is a comprehensive curriculum designed by a veteran teacher, tested, tweaked, and perfected through countless years of use and hundreds of students taught. The lessons and materials are designed using Universal Design for Learning to best meet the needs of a diverse student population.

Unit 3: Addition & Subtraction Concepts & Strategies builds a strong foundation for solving problems within 20 by helping students develop efficient, flexible strategies for both addition and subtraction. Students move beyond counting the total to more advanced methods such as counting on, counting back, making ten, using doubles and near doubles, mental math, and applying known facts to solve new problems. They explore how numbers can be decomposed and recomposed, use ten as a benchmark number, and begin to recognize patterns that support fluency. Students work with equations, number relationships, and real-world problem situations, learning to select and explain the most efficient strategy for a given problem. Throughout the unit, students engage with hands-on manipulatives, visual models, and math discussions to deepen conceptual understanding. This unit contains 12 lessons, a wide range of center activities, strategy-based practice tasks, no prep practice, and fluency-building opportunities designed to reinforce and extend learning. An end of unit assessment is included to help inform instruction, intervention, and next steps.

In Good at Math® First Grade, each unit ends with a mini Project Based Learning unit that spans multiple days and requires students to use all skills gained within the unit to solve a real world problem and/or contribute to their community in a meaningful way. All planning, execution, and reflection pages are included as well as a full, detailed unit plan. 

With Good at Math® you can take the guesswork out of your math block and know that you are providing a developmentally appropriate and sequenced math program for your learners.

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Good at Math® First Grade is a growing curriculum with 1-2 units published each month and an estimated final publishing date of December 2026. 

Good at Math® First Grade units include: 

Unit 1: Numbers to 120
Unit 2: Comparing, Ordering, and Relationships Between Numbers
Unit 3: Addition & Subtraction Strategies within 20
Unit 4: Equations, Equality, and Algebraic Thinking
Unit 5: Addition & Subtraction in Word Problems within 20
Unit 6: Addition & Subtraction within 100
Unit 7: Measurement & Length
Unit 8: Telling Time Pt2 (Continuation from GAM Kindergarten Unit 14)
Unit 9: Data, Graphs, & Analyzation
Unit 10: Money Pt2 (Continuation from GAM Kindergarten Unit 13)
Unit 11: Geometry & Spatial Reasoning
Unit 12: Fractions & Equal Shares