Pre-Algebra Midterm Review

Integers

100

Which of these situations can be represented by the opposite of -25?

A. a scuba diver is 25 feet below sea level.
B. Leon gets paid $25.

B. Leon gets paid $25. 

200

The temperature was -4 degrees in the morning. By noon, the temperature increased 6 degrees. What was the temperature at noon?

2 degrees

300

|-24| - |9| = ?

15

400

-7 - (-8) = ?

1

500

9 x (-8) = ?

-72

Rational and Real Numbers

100

Write the decimal as a fraction in simplest form: 0.04

1/25

200

Subtract: 5/6 - 8/9

-1/18

300

-3.2 x 5

-16

400

-3/4 ÷ 15/24

-6/5

500

I am a value bigger than 1/4, smaller than 1/2 and expressed as a repeating decimal.

What is 1/3 or 0.33333

Ratio, Rates, Proportions

100

What is a unit rate?

a ratio where the bottom number is a 1

200

If Mimi drives 50 miles in 2 hours, what is her rate (speed per hour)?

25 miles per hour

300

Solve for x. 3/8 = 15/x

x = 40

400

Are 5/10 and 4/8 proportional?

Yes proportional, 5/10 = 20/40 = 4/8

500

Julia texts 60 words in 4 minutes, then she texts 45 words in how many minutes?

3 minutes

Percent, Part, Whole

100

4 out of 5 parts are shaded. What is the fraction, decimal, and percent for the shaded parts?

4/5, 0.8, 80%

200

What is 0.625 as a percent rounded to the nearest whole number?

63%

300

What is 40% of 125?

50

400

There are 8 apples, 10 oranges, and 6 peaches.  What percent of the fruit is peaches?

25%

500

30% of the class forgot to do their homework. If 12 kids forgot to do their homework, how many total students are in the class? How many students did their homework?

40 total students, 28 did their homework

Percent Change/Error, Simple Interest

100

What is the equation for simple interest?

Simple interest:
interest = interest rate x principal(initial amount)

200

What percent of 19 is 4.75?

4.75/19 = p/100
25 = p

4.75 is 25% of 19

300

Juan's puppy weighed 16 pounds at the age of 2 months. The puppy weighed 60 pounds at the age of 8 months. What is the percent change in the puppy's weight?

change in pounds = 60 - 16 = 44
44 = p x 16
44/16 = p
2.75 = p

The weight increased by 275%.

400

Bree buys a purse for $90. She sells it at her store for $135. What is the percent markup on the purse?

markup = $135 - $90 = $45
45 = p x 90
45/90 = p
0.5 = p

The percent markup is 50%

500

Yuni loaned $400 to her brother. He will repay the loan by paying 2.5% simple interest for 3 years. How much will he pay in interest?

interest = 400 x 0.025 = $10
interest x 3 years = $10 x 3 = $30

He will pay $30 in interest.