Addition and Subtraction within 20 Mini-Assessment

Author: Student Achievement Partners

  • Description
  • Files

This mini-assessment is designed to illustrate the important content standard 2.OA.B.2 which sets an expectation for fluently adding and subtracting within 20 and – by the end of the grade – knowing single-digit sums from memory. It consists of carefully chosen fill-in-the-blank problems to address the breadth of addition and subtraction facts within 20. This mini-assessment is designed for teachers to use either in the classroom, for self-learning, or in professional development settings to:

  • Gain a better understanding of assessing fluency with, and memory of, single-digit sums and related differences;
  • Use in professional development as an illustration of CCSS-aligned assessment problems; and,
  • Evaluate students' progress toward 2.OA.B.2 in order to prepare to teach this material or to check fluency and memory near the end of the grade.

  • Making the Shifts

    How does this mini-assessment exemplify the instructional Shifts required by CCSSM?

    Focus Belongs to the major work of second grade
    Coherence Builds on earlier addition and subtraction fluency (1.OA.C.6) and work with addition and subtraction equations (1.OA.D.8)

    Conceptual Understanding: not targeted in this mini-assessment

    Procedural Skill and Fluency: primary in this mini-assessment

    Application: not targeted in this mini-assessment

  • Noteworthy features of this resource
    • Mathematically:
      • Uses number facts once to ensure the breadth of the standard is addressed
      • Places unknowns in all positions
      • Continues the learning trajectory started in kindergarten toward full fluency with addition and subtraction
    • As a mini-assessment:
      • Allows the teacher to evaluate students on their skill with the content in 2.OA.B.2 in order to prepare to teach 2.OA.B.2 or to check student progress after teaching 2.OA.B.2
      • Is easily altered to allow for repeated use, ensuring that students are gaining adequate practice toward fluency

Supplemental Resources