Ratios
Write all of the ways to write a ratio.
A fraction, colon (dot dot), and in words.
Find the unit rate.
410 km in 16 liters
25.63 km/liter.
Do each pair of ratios form a proportion?
2/3 and 6/9
Yes.
Julie was able to walk 16 km through the park in 6 hours. How long will it take her to walk 24 km through the park?
9 hours.
9/6 = x/10
x = 15.
Define ratio.
A comparison of two quantities.
Find the unit rate.
1500 words in 25 minutes
60 words per minute.
Do the ratios form proportions?
5/4 and 25/16
No.
The ratio of vanilla pudding to chocolate pudding in a banana split pie is 4 to 3. Olivia has 640 grams of vanilla pudding. How much chocolate pudding does she need?
480 grams.
4/3 = 8/x
x = 6.
A bag contains 15 blue marbles and 10 red marbles. Give the ratio of red to blue marbles.
10:15.
Find the unit price.
$1.12 for 8.2 grams
$0.14 / gram
Do the ratios form proportions?
8/20 and 24/60
Yes.
If there are 1200 calories in an 180 gram piece of cheesecake, how many calories are in a 130 gram piece of cheesecake?
867 calories.
10/8 = x/10
x = 12.5.
How do you determine if two ratios are equivalent?
Which is the better buy? $4.50 for a 150 gram bag of candy or $2.99 for a 120 gram bag of candy
$2.99 for 120 gram bag.
120 gram bag = $0.02 / gram
150 gram bag = $0.03 / gram
Do the ratios form proportions?
5 /7 and 25 / 49
No.
Annie bought 3 bags of special candy for $1.20. How much do 8 bags of candy cost?
$3.20.
7/5 = x/3
x = 4.2.
Give TWO examples of real-life examples where ratios are used.
Miles per gallon
Miles per hour
Beats per minute
Dollars per pound
Which is the better buy:
Ethan can buy 4 CDs for $71.96 at CD Express or 9 CDs for $134.55 at Music Rox.
Music Rox has the better buy.
Music Rox = $14.95 per CD
CD Express = $17.99 per CD
Do the ratios form proportions?
21 / 6 and 14.3 / 3
No.
Samara runs 4 miles in 38 minutes. If she continues running at the same pace, how many minutes will it take her to run 12 miles?
114 minutes
16/20 = (2x)/65
x = 26.