Ratio Basics
What is a ratio?
A comparison of two quantities using division
What is a unit rate?
A rate with a denominator of 1
What does "percent" mean?
"Per hundred" or "out of 100"
A recipe uses 4 cups of flour for 8 muffins. How much flour for 1 muffin?
0.5 cups
If a student answered 18 out of 20 questions correctly, what percent is that?
90%
Write the ratio of 3 apples to 6 oranges in simplest form.
1:2
If 10 pencils cost $4, what is the cost per pencil?
$0.40 per pencil
Write 50% as a fraction in simplest form
1/2
A car travels 120 miles in 3 hours. How long will it take to travel 200 miles at the same speed?
5 hours
A map scale shows 1 inch = 8 miles. How many miles are represented by 3.5 inches?
28 miles
If there are 10 boys and 15 girls, what is the ratio of boys to total students?
10:25 or 2:5
A runner goes 8 miles on 2 hours. What's the unit rate in miles per hour?
4 mph
What percent is equivalent to 3/4?
75%
A store has a 25% off sale. If an item costs $40, what is the sale price?
$30
A shirt originally costs $25 and is marked up 20% what is the new price?
$30
True or false: Ratios must always compare quantities with the same units.
True
A bakery makes 150 cupcakes in 5 hours. What is the rate per hour?
30 cupcakes/hour
12
A ratio of cats to dogs is 5:8. If there are 40 dogs, how many cats?
25 cats
A grocery store sells 5 pounds of apples for $7.50. What is the cost for 8 pounds?
$12
A bag has red, blue, and green marbles in a ratio of 2:3:5. If there are 20 marbles total, how many are green?
10 marbles
35 mpg
If 45 is 15% of a number, what is the number?
300
A runner finishes a marathon in 3.5 hours. If it's 26.2 miles long, what's the unit rate in miles per hour (round to the nearest tenth)?
7.5 mph
You scored 84 out of 120 on a test. What percent did you get?
70%