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.
Jada says 8 inches.
How did Han and Jada get the same measurement?
Write an equation that could show Jada’s thinking.
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 .
What do you notice about you and your partner’s measurements?
Activity 2 A Desktop to Measure
Lin is measuring her desktop in inches.
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 .
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 .
Practice Problem
Problem 1
What is the length of this rectangle in centimeters?
Write an equation to show your thinking.