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Ratios
Probability
Rational Numbers
Grade 8
Grade 8
100
Sara bought a 20-ounce jar of strawberry jam for $4. What is the unit price?
What is $0.20/oz
100
The probability of anding on heads when flipping a coin.
What is 50% or 1/2
100
1/2 x 5
What is 5/2
100
The sum of two numbers is 14 and their difference is 4. What is the bigger number?
What is 9
100
On a farm, there are c cows and 15 sheep. There are 4 more sheep than cows. Which equation represents the situation?
What is c =15 - 4
200
Michael bought a box of 20 pretzel rods for $4.40 What is the price per pretzel rod?
What is $0.22
200
The probability of rolling an odd number on a 6 sided die.
What is 50% or 1/2
200
3 - 5
What is -2
200
A student spends the same amount each week for bus fare. In 5 weeks, he spends $115. Write an equation for this relationship. Let x = number of weeks.
What is y = 23x
300
Annabelle picked 65 apples at a local orchard. 40% of the apples were green apples. How many green apples did Annabelle pick?
What is 26 apples/
300
The probability of landing on a number that is divisible by 3 on a 6 sided number cube.
What is 2/6 or 1/3 or 33.3%
300
-3/4 + 1/2
What is -1/4
300
Suppose the band sells cans of popcorn for $5 per can and cans of mixed nuts for $8 per can. The band sells a total of 240 cans and receives a total of $1614. Find the number of cans of popcorn.
What is 102
300
A company charges $45 a day for the car as well as charging a one-time $25 fee for the car’s navigation system (GPS). Write an expression for the cost in dollars, c, as a function of the number of days, d, the car was rented.
What is C = 45d + 25
400
On a city map, 2 inches represents 10 miles. The library and the bank are 5 inches apart on the map. What is the actual distance in miles between the library and the bank?
What is 25 miles.
400
A bag contains 100 marbles; some are red and some are purple. Suppose a student, without looking, chooses a marble out of the bag, records the color, and then places that marble back in the bag. The student has recorded 9 red marbles and 11 purple marbles. Using these results, predict the number of red marbles in the bag.
What is 45. 9 red + 11 purple = 20 total (9x5) + (11x5) = 20x5 45 + 55 = 100
400
-1/3 ÷ 1/2
What is -2/3
400
WITHOUT SOLVING THE SYSTEM, tell how many solutions the following systems of equations have (one, no solution, infinitely many solutions)? Explain why. a. y = 2x – 4 3y = 6x –12
What is infinitely many solutions
400
A line has a zero slope and passes through the point (–5, 4). What is the equation of the line?
What is y = 4
500
Suppose you are testing two fertilizers on bamboo plants A and B, which are growing under identical conditions. Plant A is 6 cm tall and growing at a rate of 4 cm/day. Plant B is 10 cm tall and growing at a rate of 2 cm/day. At how many days will the bamboo plants be the same height?
What is 2 days
500
Write an equation for the line that has a slope of 1/2 and passes though the point (–2, 5)
What is y = 1/2x + 6