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Math Grade 6-8 Answer Key

Ratios & Proportions

Set up and solve proportions, unit rates, and percent problems.

Answer Key
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Ratios & Proportions

Set up and solve proportions, unit rates, and percent problems.

Math - Grade 6-8

Instructions: Solve each problem. Show your work. Express ratios in simplest form.
  1. 1

    A car travels 240 miles in 4 hours. What is the unit rate (speed)?

    60 mph
  2. 2

    Simplify the ratio 18:24.

    3:4
  3. 3

    Solve for x: 3/4 = x/20.

    x = 15
  4. 4

    A recipe uses 2 cups of flour for every 3 cups of oats. How many cups of flour are needed for 9 cups of oats?

    6 cups of flour
  5. 5

    On a map, 1 inch represents 50 miles. Two cities are 3.5 inches apart on the map. How far apart are they?

    175 miles
  6. 6

    What is 15% of 80?

    12
  7. 7

    A shirt originally costs $40 and is on sale for 25% off. What is the sale price?

    $30
  8. 8

    If 6 workers can complete a job in 8 days, how many days will it take 12 workers to complete the same job?

    4 days
LivePhysics.com Math - Grade 6-8 - Answer Key