Number Sense (Part 1)

Scientific Notation

100

Express 0.00009 in scientific notation

9 x 10^-5

200

Express 0.00000087 in scientific notation.

8.7 x 10^-7

300

6.7 x 10³ =

6,700

400

Express 3,200,000 in scientific notation.

3.2 x 10⁶

500

What is 460,000,000 in scientific notation?

4.6 x 10⁸

Rational Numbers

100

1,000 is multiplied by a number between 0 and 0.5.  The answer has to be between what two numbers?

0 and 500

200

Three friends decide to get matching outfits. Shoes cost $90 a pair. Pants cost $40 each, and shirts cost $15 each.  What is the total cost for all three friends?

$435

300

Solve (-6) - (4) + (-5)

-15

400

Maria uses 3/4 of a cup of milk per serving to make her decilious pancakes.  How many cups of milk does she need to make 8 servings?

6 cups

500

13/16 - (1/2 + 1/8) = 

3/16

Fractions, Decimals, Percents

100

Kevin makes 14 of his 20 shots in a basketball game.  What is his field goal shooting percentage?

70%

200

Yesterday, 9/24 students were absent from class. About what percentage of students were absent?(closest answer wins)

37.5%

300

Write the decimal AND percentage form of 1/4.

0.25

25%

400

What is the decimal and percent form of 3/4?

0.75

75%

500

What is the decimal and percent form of 2/6?

0.333

33.3%

Percentages

100

Sammy brought a 32oz bottle of water to school.  By lunchtime, the bottle had 16oz left.  By what percentage did the amount of water decrease?

50%

200

A $50 shirt is on sale for $40.  What is the percentage of decrease in the price of the shirt?

20%

300

Today's class attendance increased from 30 to 33.  By what percentage did the attendance increase?  

10%

400

Your job just gave you a 10% raise.  You used to make $16.00 an hour.  Now how much do you make an hour?

$17.60

500

In your class, there are 30 students.  20% of them are absent today.  How many students are present?

24 students

Real World Problems

100

A shirt at the mall regularly sells for $36.  They are on sale for 25% off.  What is the sale price of the shirt?

$27

200

Katherine bought a pair of Jordans for $200 and later resold it for a 30% profit.  How much did Katherine sell the Jordans for?

$260

300

Kevin invests $500 into buying stocks. A few months later, he sells his stocks after it increases by 20%.  How much money did Kevin get back in total from his investment?

$600

400

Joana puts $300 in a bank account.  Each year the account earns 3% simple interest.  How much interest will be earned in four years?

$36

500

A salesperson at a department store earns 3% commission on all sales.  How much commission does the salesperson earn on a $800 sale?  

$24