Circles
The distance from the center of a circle to the outside is called the...
radius
If a store is having a sale, are they increasing or decreasing their prices?
decreasing
If there are 12 boys and 12 girls in a class, what is the ratio of boys to girls?
1:1
If there are 21 weeks in the semester, and this is week 18, what proportion of this semester of math class have we finished after today?
(18/21) or (6/7)
If we want to measure how something changes over time, what type of graph should we use to show our data?
A line graph
The distance from one side of a circle to the other, through the center, is called the...
diameter
If the price of a shirt increases from $16 to $20, what was the percentage increase?
25%
If there are 3 green cars, and 5 black cars, is the ratio of green cars to black cars the same as the ratio of black cars to green cars?
No, 3:5 and 5:3
What is the difference between a ratio and a proportion?
A ratio compares the amounts of two or more things. A proportion compares an amount of one thing to the total.
(1/3) of 100 is __________ 33% of 100
greater than. >
The perimeter of a circle is also called the...
circumference
Jane’s puppy weighs 5kg. Polly’s puppy weighs 7kg. How much heavier is Polly’s puppy? Answer with a percentage
40%
Share 600 in the ratio 7:3:5
280:120:200
I need to drive 50km. If I drive (2/5) of the way there, and then drive 15km more, what proportion of the total distance have I driven?
If you have a cone and a cylinder with the same height and radius, what is the ratio of the volume of the cone to the volume of the cylinder?
1:3
Pi is the ratio of which two parts of a circle?
the circumference over the diameter, c/d
Is increasing a price from $20 to $30 the same percentage as decreasing from $30 to $20?
No, 50% increase, 33.33% decrease
The angles of a quadrilateral are expressed in the ratio 3:4:5:6. Find the size of each angle.
60:80:100:120
Mary has (2/5) of a bag of marbles, Tony has (3/8) of a bag of marbles. They put their marbles together and then each take half of them.
What proportion of the bag of marbles does each child get?
(31/80)
What is the difference between simple and compound interest?
Simple interest is based on the principal amount of the loan. Compound interest also counts the interest already accrued when figuring out the next period's interest amount.
Circle A has a radius of x and an area of y:
area = x, radius = y
Circle B's radius is half of Circle A's.
What is the area of Circle B in terms of x?
(1/4)x
A piece is cut from a 130cm length of wood so that the remaining length is 104cm. What percentage of the wood has been cut off?
20%
Simplify the ratio (1/2):(1/8):(1/6)
12:3:4
What is data?
A collection of facts that we can find by looking, asking or measuring.