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.

Han 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  .

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.

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.

Equation:

The short side of the desktop is .

Problem 1

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

2. Write an equation to show your thinking.