Write the ratio of the first number to the second number 3 ways: 4, 9
4:9
4 to 9
4/9
100
Find x:
128 miles/4 weeks = x / 1 week
32 miles
100
Find the mistake: 2 pounds of apples cost $3. Find the cost (x) of 18 pounds of apples.
3 pounds/ $2 = x/18 pounds
Should be $2/3 pounds = x / 18 pounds
100
comparing between numbers; the relationship between two or more things
Examples: 4:7, 4 to 7, 4/7
Ratios
100
A filter for an aquarium cleans 400 gallons of water in 60 minutes. How many gallons of water does the filter clean in 5 minutes?
400 gal/60 minutes = x gallons/ 5 minutes
x = 33.33 gallons
200
There are 31 pink beads and 16 purple beads on Suzie's necklace. What is the ratio of the number of pink beads to the number of purple beads?
31:16
200
What is the unit rate for 42 meters/15 seconds?
A. 2.8 m/ 1 sec
B. 3.25 m / 1 sec
C. 9 m / 1 sec
A
200
y/9 = 40/72
What is y?
y = 5
200
2/25 = 4/50
These two ratios, or fractions, are the same, or ________.
Equivalent
200
A modem transfers 100 kilobytes of data in 2 seconds. At this rate, how long will it take to transfer 280 kilobytes of data?
5 seconds
300
In the 2000 Winter Olympics, the Netherlands earned 12 gold medals, 9 silver medals, and 4 bronze medals. Write the ratio of gold medals to all medals. __________________________
12/25
300
I take 5,000 steps for every 2 miles I walk. How many steps do I take in 1 mile?
5,000 steps / 2 miles = 2,500 steps / 1 miles
300
1/4 = c/ 17
What is c?
c = 4.25
300
3/5 = 4/x
To find x, first you ______________ what two numbers?
Then, what do you do?
multiply 5x4, then divide by 3
300
In 2000, the average male television viewer watched about 30 hours of TV in 7 days. About how many hours of TV did the average male viewer watch in 28 days?
120 hours
400
The perimeter of a circle is 27 feet. The perimeter of a rectangle is 10 yards. What is the ratio of the perimeter of the rectangle to the perimeter of the circle?
10 to 27
400
A swimmer completed a 200-meter race in 2 minutes. What was the swimmer's average speed?
200 meters/ 2 minutes = 100 meters per minute
400
40 is to y as 8 is to 14
40/y = 8/14
y = 5
400
I can go 200 miles on 16 gallons of gas. If I want to know how far I can go on ONE gallon of gas, I want to find the _______________ ______________.
Unit Rate
400
You can walk 3 miles in 64 minutes. How many miles can you walk in 10 minutes? (round your answer to the nearest hundredth)
3 miles/ 64 minutes = x miles/ 10 minutes
x = .47 miles
500
The Missouri river is 2,315 miles long, but boats can only travel on or navigate 735 miles of total length. Write the ratio of the river’s navigable length to it’s total length as a fraction in simplest form.
What is 75/2315, reduced to 147/463
500
A runner completed a 100-meter race in 1 minute and 5 seconds. What was the runner's average speed? (in meters per second?)
1.53 meters per second
or
1.54 meters per second
500
8/15 = a/9
What is a?
a = 4.8
500
Another word for two equivalent ratios
Example: 4/5 = 8/ 10
Proportion
500
Your dog eats 11 ounces of dog food each day. How many days will a 20 pound bag of food last?
Hint: there are 16 ounces in 1 pound