Lesson 10 Measure with a Torn Tape

    • Let’s measure without starting at 0.

Warm-up True or False: Constant Difference

Decide if each statement is true or false. Be prepared to explain your reasoning.

Activity 1 The Notebook Problem

Jada and Han used an inch ruler to measure the short side of a notebook.

Ruler, from 0 to 12 by ones, measuring short side of a notebook. Notebook side starts at 0, ends at 8.

Han says 8 inches.

Ruler, from 2 to 12, by ones, measuring short side of a notebook. Notebook Side starts at 2, ends at 10.

Jada says 8 inches.

  1. How did Han and Jada get the same measurement?

  2. Write an equation that could show Jada’s thinking.

  3. Measure an object using Jada’s method.

    • I measured a .

    • I started with the number .

    • I ended with the number .

    • Equation: .

    • The length of my object is  .

  4. What do you notice about you and your partner’s measurements?

Activity 2 A Desktop to Measure

Lin is measuring her desktop in inches.

  1. What is the length of the long side of the desktop? Show your thinking using drawings, numbers, or words.

    Measuring tape, 16to 40, by ones, measuring the long side of a desktop. Long side begins on tape at 16 and ends at 40.

    Equation:

    The long side of the desktop is .

  2. What is the length of the short side of the desktop? Show your thinking using drawings, numbers, or words.

    Measuring tape, from 16 to 40, by ones, measuring short side of a desk. Short side begins on tape at 16 and ends at 34.

    Equation:

    The short side of the desktop is .

Practice Problem

Problem 1

  1. What is the length of this rectangle in centimeters?

    Rectangle above a ruler. Rectangle begins above Ruler at 17 and ends at 32.

  2. Write an equation to show your thinking.