NC.1.OA.4

Unpacking Clarification

The focus of this standard is for students to develop an understanding of the relationship between addition and subtraction by either solving the problem by adding up or by changing the unknown-addend problem into a subtraction problem. In this standard, students are expected to solve unknown-addend word problems. This work intersects with the unknown-addend and change unknown problem types in NC.1.OA.1. The focus of this standard is for students to develop an understanding of the relationship between addition and subtraction by either solving the problem by adding up or by changing the unknown-addend problem into a subtraction problem. Standard NC.1.OA.6 describes strategies that students are expected to use while solving these problems. Initial work with this standard should include small numbers (within 5 or 10) as well as the use of concrete objects (manipulatives) to help students develop an understanding of these types of problems. 

Possible Activating Strategies

Teacher Resources

• Tools 4 NC Teachers

  • Cluster 8 Lessons

• Math Expressions - (Barnes and Hearne) - Standards Alignment

• Motivation Math

• Think Up! Math

• Khan Academy - 1st Grade Math

• Eureka Math/Engage NY Free Resources

  • Embarc Online (Eureka Math) 

    • G1 M1 Topic G: Subtraction as an Unknown Addend Problem

    • G1 M1 Topic H: Subtraction Word Problems

    • G1 M2 Topic B: Counting On or Taking From Ten to Solve Result Unknown and Total Unknown Problems

    • G1 M2 Topic C: Strategies for Solving Change or Addend Unknown Problems

  • Standards Alignment

  • Zearn Math - Online Support Practice for Eureka Math (Requires free account)

• North Carolina Collaborative for Mathematics Learning - Grade 1 Instructional Framework

• NCDPI Resources

  • Math Games Grade 1

  • Grade 1 Math Assessment Practice Prompts

    • Operations & Algebraic Thinking

    • Numbers & Operations in Base Ten

    • Measurement & Data

    • Geometry