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Ratios
What's the going rate?
Proportionally proportioned proportion problems
Let Me Be Direct...
Gear Populaiton
100
This is the ratio of grade levels in the middle school to grade levels at the high school.
What is 1:2 or 1/2 or 1 to 2? (2:4 is incorrect)
100
Mr. Newman buys 20 lbs of crayfish for $44 total. This is the price per pound.
What is $2.20 per pound?
100
This is the value that would make the following two ratios proportional. 3/8 and x/24
What is 9?
100
To be direct variation, a graph must do two things...
What is be straight and go through (0,0)?
100
The purpose of a idler gear is this.
What is allow driving gear and driven gear to move in the same direction?
200
Mr. Newman has 6 pennies, 2 dimes, 5 quarters and a nickle. This is the ratio of pennies to total coins.
What is 3:7 or 3/7 or 3 to 7?
200
Ms. Herlihy drives 200 miles on 8 gallons of gas. If she takes 8/200, the units she gets are this.
What are gallons per mile?
200
A scale model drawing is 1 inch to 4 feet in the real world. If a line on the drawing is 4.5 inches, how many feet is that in the real world?
What is 18 feet?
200
In order to be direct variation, a table must follow this rule.
What is have a common scale factor from x to y?
200
At the next social, Mr. Newman marks 30 7th grade students wrists with a stamp as they walk into the cafeteria. After two hours, he randomly checks 40 7th grade students in the cafeteria, 12 of them are marked with the stamp. This is how many 7th grade students there are at the social.
What is 100 7th grade students?
300
Mr. Newman buys red and blue balloons. If the ratio of red balloons to total balloons is 7:15, this is the ratio of blue to red balloons?
What is 8:7 or 8/7 or 8 to 7?
300
Ms. Jensen has a leak in her basement. At 4:00 pm the water was at 1.3 feet. At 4:15 pm the water was at 1.5 feet. This is the rate the water is increasing per hour.
What is 0.8 feet per hour?
300
On Monday, Mr. Newman spent 15 minutes grading 6 papers. On Tuesday, he had to grade 20 more papers, this is how much time he would have left for grading on Tuesday.
What is 50 minutes?
300
In order to be direct variation (proportional) an equation must be able to be written in this form.
What is y= kx?
300
The driving gear has 80 teeth and the driven gear has 150 teeth. If the driving gear is spun 10 times, this is how many times the driven gear spins.
What is 5 and 1/3 times?
400
Mr. Newman picks out 205 pieces of candy, 75 of them were chocolate and 25 of them were vanilla, this is the ratio of chocolate candies to non-chocolate and non-vanilla candies.
What is 5:7 or 5/7 or 5 to 7?
400
This is the cheapest unit price for apples (store and price): Stop and Shop --> $13 for 5 lbs Big Y --> $5.40 for 2 lbs Big E --> $7.35 for 3 lbs
What is Big E's at $2.45 per pound?
400
Steve is making a mixture of pink which requires 8 parts red and 5 parts white. If he mixes 20 pints red and 15 pints white, this is what he would have to add to adjust the color to what he needs.
What is add 4 more pints red?
400
To find slope of a line you always find the R_____ over the R____.
What is rise and run?
400
Mr. Newman has a collection of crayfish in a pond in his backyard. In July he catches, marks and releases 90 crayfish. At the end of July he catches 50 crayfish and 36 of them are marked. This is how many crayfish he had in July.
What is 125 crayfish?
500
All 42 students on Team L went out for pizza. 20 of them had pepperoni on their pizza. 12 of them had sausage on their pizza. If 5 students were in both of those groups, because they got both toppings, this is the ratio of students show had either pepperoni and/or sausage on their pizza to total students.
What is 9/14 or 9:14 of 9 to 14?
500
This is better gas mileage out of the three cars and it mpg... Car A gets 100 miles on 4.4 gallons. Car B gets 24 miles per gallon Car C gets 0.04 gallons per mile
What is car C at 25 miles per gallon?
500
When it is released in July 2018, an iPhone Y costs $1300 for 128 GB of memory and costs $1900 for 192 GB of memory. The relationship between memory and cost is this, proportional or not proportional.
What is not-proportional?
500
The following points (24, 1008) and (17, 714). This is the slope between these points.
What is 42?
500
A driving gear has 80 teeth, the idler gear has 30 teeth and the driven gear has 100 teeth. This is the fewest number of times you could spin the driving gear for all three gears to be back where they started.
What is 40 times?