Lesson 3

Select all of the numbers that are greater than $\text-5$.

1.3

$\text-6$

$\text-12$

$\frac{1}{7}$

$\text-1$

$\text-4$

Here are the boiling points of certain elements in degrees Celsius:

• Argon: -185.8
• Chlorine: -34
• Fluorine: -188.1
• Hydrogen: -252.87
• Krypton: -153.2

List the elements from least to greatest boiling points.

Decide which of the following quantities can be represented by a positive number and which can be represented by a negative number. Give an example of a quantity with the opposite sign in the same situation.

1. Tyler’s puppy gained 5 pounds.
2. The aquarium leaked 2 gallons of water.
3. Andre received a gift of $10.
4. Kiran gave a gift of $10.
5. A climber descended 550 feet.

1. On the number line, label the points that are 4 units away from 0.

   

   

2. If you fold the number line so that a vertical crease goes through 0, the points you label would match up. Explain why this happens.

3. On the number line, label the points that are $\frac52$ units from 0. What is the distance between these points?