Circles
The length from the center of a circle to the outside is called the...
radius
What is (4/5) as a percent?
80%
The top number of a fraction
numerator
If I want to show changes, then I should use a ____ graph.
line
If the ratio of boys to girls in the class is 5:4, what fraction of the class are girls?
4/9
The length from one side of a circle to the other, through the center, is called the...
diameter
A t-shirt normally costs $15, but there is a 20% sale.
How much do I need to pay to buy the shirt?
15 * (100%-20%) = $12
The bottom number of a fraction
denominator
If I want to show percents, then i should use a ____ graph.
pie
Share 48 in the ratio 2:4
48÷(2+4)=8
8 x 2 = 16
8 x 4 = 32
16:32
The perimeter of a circle is also called the...
circumference
If the ratio of blue to red cars is 3:5, then what percent of the cars are red?
5÷(3+5) = 62.5%
3:5 is an example of a _____.
ratio
If I want to compare numbers, then I should use a ____ graph.
bar
BONUS
300 points
How do you find the area of a circle if you know its diameter?
diameter ÷ 2 = radius
radius x radius x pi = area
The word percent has two parts, 'per' and 'cent'.
What does 'cent' mean?
100
What word means 'for each 100'?
percent
BONUS
400 points
How do you say '3:4:5' in English?
three to four to five
Circle 1's radius is half (1/2) of Circle 2's.
How much smaller is Circle 1's area?
It is 75% smaller, or (1/4) x Circle 2's area.
Why will you make more money with compound interest than with simple interest?
With compound interest, you also make interest from any interest you have already made. With simple interest, you only make interest from the starting money.
1000+ (1000 x 5% x 3) or
1000 x 105% x 105% x 105%
circumference divided by diameter is equal to _____.
pi
The names and number we put in graphs are called _____.
data
How are ratios different than fractions?
Ratios usually compare a part to a part, but fractions compare a part to a whole. Ratios can compare many numbers, but fractions can only compare two numbers.