# Interpreting Negative Numbers

Warmup

Activity #1

Use Thermometers to Understand Negative Numbers.

• Compare the thermometers below and answer the questions that follow.

Activity #2

Use Height to Understand Negative Numbers.

Here is a picture of some sea animals. The number line on the left shows the vertical position of each animal above or below sea level, in meters.

• Observe closely the vertical positions of the animals below and answer the questions that follow.

(1.) How far above or below sea level is each animal? Measure to their eye level.

A mobula ray is 3 meters above the surface of the ocean.

(2.) How does its vertical position compare to the height or depth of the jumping dolphin?

(3.) How does its vertical position compare to the height or depth of the flying seagull?

(4.) How does its vertical position compare to the height or depth of the octopus?

From the diagram above, an albatross is 5 meters above the surface of the ocean.

(5.) How does its vertical position compare to the height or depth of the jumping dolphin?

(6.) How does its vertical position compare to the height or depth of the flying seagull?

(7.) How does its vertical position compare to the height or depth of the octopus?

Activity #3

Integer Addition and Subtraction with Thermometers.

• In the applet below, use the slider to answer the questions.

Click on the correct answer for each question below.

Challenge #1

Below is a set of cards

• First, order the integer cards from least to greatest. After you order the cards, pause here so your teacher can review your work.
• Then add the new set of cards to the first set so that all of the cards are ordered from least to greatest.

Challenge #2

One of the particles in atoms is called an electron. It has a charge of -1. Another particle in atoms is a proton. It has charge of +1. The overall charge of an atom is the sum of the charges of the electrons and the protons. Here is a list of common elements:

Find the overall charge for the rest of the atoms on the list.

Challenge #3

Compare the numbers using >, =, or <.

Quiz Time