Author:
DAWNE COKER
Subject:
Mathematics
Material Type:
Activity/Lab, Assessment, Formative Assessment
Level:
Lower Primary
Tags:
  • Cl8Assessment
  • Cluster 8
  • Compare
  • Comparison
  • Difference
  • Equation
  • Expression
  • Formative
  • Practice
  • Problem
  • Review
  • Solving
  • Subtract
  • Subtraction
  • Task
  • Unit 8
  • Word
  • License:
    Creative Commons Attribution
    Language:
    English
    Media Formats:
    Downloadable docs

    Education Standards

    T4T Problem Solving (Compare, Difference Unknown)

    T4T Problem Solving (Compare, Difference Unknown)

    Overview

    This resource is from Tools4NCTeachers.  

    This is a set of ten (10) tasks, which may be used for instruction or assessment.  Each file contains a separate task, rubric, and recording sheets.  The word problems in these tasks focus around making comparisons, where the difference between the two quantities is unknown.  For example, students may find the difference between two measurements or between the two sets of objects.

    Remix this resource to include extension ideas or addtional tasks.

    Here is a sample task from this resource.  Click each file to view fully-formatted tasks, rubrics, and accompanying materials.

    NC.1.OA.1

    Baked Cookies

    Domain

    Operations and Algebraic Thinking

    Clusters

    Represent and solve problems.

    Understand and apply the properties of operations.

    Add and subtract within 20.

    Standards

    NC.1.OA.1 Represent and solve addition and subtraction word problems, within 20 with unknowns, by using objects, drawings, and equations with a symbol for the unknown number to represent the problem, when solving:

    • Add to/Take from-Change Unknown
    • Put together/Take Apart-Addend Unknown
    • Compare-Difference Unknown

    NC.1.OA.4 Solve an unknown-addend problem, within 20, by using addition strategies and/or changing it to a subtraction problem.

    NC.1.OA.6 Add and subtract, within 20, using strategies such as:

    • Counting on

    • Making ten

    • Decomposing a number leading to a ten

    • Using the relationship between addition and subtraction

    • Using a number line

                • Creating equivalent but simpler or known sums

    Compare-Difference Unknown

    Materials

    SF, cubes or counters, pencil

    Task

    Provide materials to the student.  Read the problem to the student:  Jessica baked 12 cookies.  Julia baked 8 cookies.  How many fewer cookies did Julia bake than Jessica?  Write a number sentence that matches this story.  Use a symbol for the unknown number.

    Once a number sentence is written, say: Solve the problem.  Show your thinking with pictures, numbers, or words.

     

    Continuum of Understanding

    Not Yet Proficient

    Response includes 0-1 of the descriptors in “Meets Expectations”

    Strategies Used:

    1. Trial and Error
    2. Counting All
    3. Counting On
    4. Makes Tens
    5. Basic Facts
    6. Think Addition
    7. Creates easier or known sums
    8. Doubles
    9. Doubles +/- 1, 2
    10. Other:

    Progressing

    Response includes 2 of the descriptors in “Meets Expectations”

    Meets Expectations

    Response includes all of the descriptors in “Meets Expectations”

    • Correctly solves the problem: 4 fewer cookies
    • Clearly explains using strategies such as basic facts, near-doubles, and/or the relationship between addition and subtraction (instead of counting all)
    • Equation is accurate (e.g. 12 – 8 = ? or 12 = 8 + ?)

     

     

     

     

     

     

    Standards for Mathematical Practice

    1.  Makes sense and persevere in solving problems.

    2.  Reasons abstractly and quantitatively.

    3.  Constructs viable arguments and critiques the reasoning of others.

    4.  Models with mathematics.

    5.  Uses appropriate tools strategically.

    6.  Attends to precision.

    7.  Looks for and makes use of structure.

    8.  Looks for and expresses regularity in repeated reasoning.

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Jessica baked 12 cookies.  Julia baked 8 cookies.  How many fewer cookies did Julia bake than Jessica? 

    Write a number sentence that matches this story.  Use a symbol for the unknown number.

    Solve the problem.

    Show your thinking with pictures, numbers, or words.

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

                                                                                              cookies