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K–12 teaching and learning · from the UNC School of Education

Using the Number Line to Compare

http://illuminations.nctm.org/LessonDetail.aspx?ID=L37

A lesson plan for grades K–2 Mathematics

Provider: National Council of Teachers of Mathematics


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In this lesson, the third of a seven-part unit from Illuminations, students determine differences using the number line to compare lengths. Because this model is based on linear measurement, it is a distinctly different representation from the models presented in the first two lessons of this unit. At the end of this lesson, children are encouraged to predict differences and answer puzzles involving subtraction.

North Carolina Curriculum Alignment

Mathematics (2004)

Grade 1

  • Goal 2: Measurement - The learner will use non-standard units of measure and tell time.
    • Objective 2.01: For given objects:
      • Select an attribute (length, capacity, mass) to measure (use non-standard units).
      • Develop strategies to estimate size.
      • Compare, using appropriate language, with respect to the attribute selected.

Grade 2

  • Goal 2: Measurement - The learner will recognize and use standard units of metric and customary measurement.
    • Objective 2.01: Estimate and measure using appropriate units.
      • Length (meters, centimeters, feet, inches, yards).
      • Temperature (Fahrenheit).

Kindergarten

  • Goal 2: Measurement - The learner will explore concepts of measurement.
    • Objective 2.01: Compare attributes of two objects using appropriate vocabulary (color, weight, height, width, length, texture).