IM Pre-Algebra Unit 3 Pre-Assessment

A dolphin is at the surface of the ocean. What is the dolphin's elevation? (Answer only with a number)

Answer explanation

The surface of the ocean is at an elevation of 0 feet! So if a dolphin is at the surface, they are 0 feet deep into the ocean.

The dolphin dives 20 feet below the surface of the ocean. What is its new elevation? (Answer with only a number, no words/units)

Answer explanation

When the dolphin goes DOWN or UNDER the surface of the sea, it is entering into a negative elevation. So if the dolphin is 20 feet below the surface, it is at an elevation of -20 feet.

Which letter is placed at the number -1?

• A

• B

• C

• D

• E

Answer explanation

The number line is divided into fourths, so 1 whole would be represented by 4 smaller sections. Because we were trying to find -1, it was found four spaces to the left of 0.

Which letter is placed at the number 1.75?

• A

• B

• C

• E

• F

Answer explanation

The number line is divided into fourths, so 1 whole would be represented by 4 smaller sections.

Which letter is placed at the number -5/2?

• A

• B

• C

• E

• F

Answer explanation

The number line is divided into fourths, so 1 whole would be represented by 4 smaller sections.

Kiran says that -2 < -5. Do you agree with Kiran?

• Yes

• No

Put these numbers in order of their distance from 0 on a number line, starting with the smallest distance.

• A, B, C, D, E, F, G, H

• D, C, E, F, B, G, A, H

• H, A, G, B, F, E, C, D

• H, G, F, E, D, C, B, A

Find the value of:

 $\left|-12.7\right|$  

• 12.7

• -12.7

• 12/7

• -7/12

Answer explanation

Absolute value bars mean that you should find the distance from zero of whatever value is in the bars. 

Find the value of:

 $\left|11\frac{1}{4}\right|$  
(Write your answer as a decimal)

Andre received and spent money in the following ways last month. For each example, write a positive or negative number to represent the change in money from his perspective: (Write all answers as only numbers with no words/letters/units)

His uncle gave him $25 as a present.