Percent Change
Concept Checks
Prime Factorization
MATHS
Ratios
100
The sales tax rate is 7 %. What is the sales tax on a $164.00 purchase?
$12.30
100
0.8 + 0.2x = 1.2
x=2
100
Prime Factorization of 36
36 = 2^2 x 3^3
100
8/3.2=n/1.2
x=1.6
100
A bag contains 72 marbles, some green and some red. The ratio of green marbles to red ones is 3 : 5. How many green marbles are there?
27 marbles
200
What is a 10% tax on a $25 purchase
$2.50
200
The $120 repair bill included $36 for parts and the rest for labor. What percent of the bill was for labor?
70%
200
Prime Factorization of 72
2x2x2x3x3
200
Devon draws one marble from a bag containing 5 red, 3 green, and 4 yellow marbles.
What is the probability that Devon draws a green marble?
3/12 or 1/4 or 25%
200
A kennel has 110 dogs in total, some are puppies and some are adult dogs. The ratio of puppies to adult dogs in a kennel is 2 : 3. How many puppies are there?
44 puppies
300
Ann works in a supermarket for $10.00 per hour. If her pay is increased to $12.00, then what is her percent increase in pay?
20% or $2.00
300
What is the length of a diagonal of a rectangle that is 24 inches long and 10 inches wide?
15 inches
300
Prime Factorization of 24
2 x 2 x 2 x 3
300
How much money is a 20% down payment on a $23,900 car?
$4,780
300
Ethan and Madison share a reward of $84 in a ratio of 4 : 2. How much does Ethan get?
56
400
The price of oil decreased from $54 per barrel to $50 per barrel. What is the percent decrease in oil prices?
7%
400
Simplify:(4 x 10^4 )(3 x 10^3)
2x10^-6
400
Prime Factorization of 144
2 x 2 x 2 x 2 x 3 x 3
400
Solve: 3x = 42
x=14
400
In a cookie mix, we find butter cookies, no-bake cookies, and raisin cookies in a ratio of 4 : 3 : 2. If a bag of the mix contains 40 raisin cookies, how many butter cookies are there?
180 cookies
500
In a small town, the population increased from 25,000 people in 1990 to 32,000 people in 2000. What is the percent increase in population?
28%
500
What is the volume of a brick with these dimensions length is 8 inches, width is 4 inches, and height is 3 inches?
96 inches
500
Prime Factorization of 50
2 x 5 x 5
500
Simplify (3) (2) + (1) / (1)(2)
8
500
A kennel has 120 dogs in total, some are puppies and some are adult dogs. The ratio of puppies to adult dogs in a kennel is 2 : 3. How many puppies are there?
48 puppies