# Lesson 1

Interpreting Negative Numbers

Let's review what we know about signed numbers.

### Problem 1

It was $$\text- 5 ^\circ \text{C}$$ in Copenhagen and $$\text- 12 ^\circ \text{C}$$ in Oslo. Which city was colder?

### Problem 2

1. A fish is 12 meters below the surface of the ocean. What is its elevation?
2. A sea bird is 28 meters above the surface of the ocean. What is its elevation?
3. If the bird is directly above the fish, how far apart are they?

### Problem 3

Compare using >, =, or <.

1. 3 _____ -3
2. 12 _____ 24
3. -12 _____ -24
4. 5 _____ -(-5)
5. 7.2 _____ 7
6. -7.2 _____ -7
7. -1.5 _____ $$\frac {\text{-}3}{2}$$
8. $$\frac {\text{-}4}{5}$$ _____ $$\frac {\text{-}5}{4}$$
9. $$\frac {\text{-}3}{5}$$ _____ $$\frac {\text{-}6}{10}$$
10. $$\frac {\text{-}2}{3}$$ _____ $$\frac13$$

### Problem 4

Han wants to buy a \$30 ticket to a game, but the pre-order tickets are sold out. He knows there will be more tickets sold the day of the game, with a markup of 200%. How much should Han expect to pay for the ticket if he buys it the day of the game?

(From Unit 4, Lesson 7.)

### Problem 5

A type of green paint is made by mixing 2 cups of yellow with 3.5 cups of blue.

1. Find a mixture that will make the same shade of green but a smaller amount.

2. Find a mixture that will make the same shade of green but a larger amount.

3. Find a mixture that will make a different shade of green that is bluer.

4. Find a mixture that will make a different shade of green that is more yellow.

(From Unit 2, Lesson 1.)