Name _________________________

Unit 4 Review

Simplify each ratio. Write your answer in two forms.

- 3 to 15

- 4 : 8

- 10 to 12

Write a rate that compares the quantities described in each problem.

- 25 cookies on three trays

- 24 cans per case

Write a unit rate for each.

- How many students per classroom if there are 75 students in three classrooms?

- How many donuts per box are there if there are 26 donuts in two boxes?

Identify whether or not each pair of ratios form a proportion. Write yes if they do, no if they do not.

Use mental math to solve for the unknown value of each proportion.

Find the actual dimensions using proportions.

- The scale of the drawings shows that 2” equals 5 feet. If the drawing shows the height of the building is 8”, how tall is the building?

- The scale of the map shows that 1” equals 15 miles. If the map shows 5 inches between towns, what is the actual distance between them?

Simplify each ratio to find the scale factor.

Complete the chart.

Ratio | Fraction | Decimal | Percent |

25 out of 100 | 0.25 | ||

0.20 | |||

45 out of 100 | 45 % | ||

98 % |

Write each fraction as a percent.

20.

21.

22.

Write each decimal as a percent.

23. 0.6

24. 0.37

25. 0.58

Find the percent of each number.

26. What is 10% of 100?

27. What is 11% of 40?

28. 35 is what percent of 70?

29. 20 is 75% of what number?

Calculate each new price based on the discount and the original price. Round to the nearest cent if needed.

29. $19.95 original price discounted 20%

30. $99.00 original price discounted 15%

31. $12.50 original price discounted 10%

Calculate the amount paid including sales tax if the sales tax is 5%. Round to the nearest cent if needed.

32. If the item costs $85.00, the total is _______________

33. If the items costs $15.50, the total is ________________

34. If the item costs $22.00, the total is _______________

Bonus

Your bill at a restaurant was $50.00, sales tax is 10%, and you leave a 20% tip. How much do you leave your waiter?