Download Percent of a number. Examples: What is 20% of 32? 6.4 20% of what

1. Percent of a number. Examples:
a. What is 20% of 32?
6.4
b. 20% of what number is 19?
95
What is the difference between these two problems, and how do you solve them?
Answers will vary
2. Percents and their fraction equivalents. Example- what is the fraction equivalent of
60%?
60/100, 6/10, simplest form is 3/5
3. Rate & Unit Rate
Ex. There are 15 cars for every 60 motorcycles. What is the unit rate of cars to
motorcycles?
15:60 or 1: 4
4. Plugging numbers into unknown formulas. Ex: Finding Density
The formula for density is D= M/V
If a rock weighs 14 grams, and its’ volume is 2 cm3, what is the density of the rock?
7 g/cm3
5. Which is the better buy? Rate? Examples:
a. Amy drove to her mother’s house, which is 204 miles away. If it took her 3 hours, what
was her average speed?
204 miles/3 hours = 68 miles per hour
b. Four gallons of gasoline cost $16.80. What is the price per gallon?
$16.80 / 4 gallons = $4.20 per gallon
c. A T-shirt launcher can launch 5 shirts in 20 minutes. What is the rate in shirts per
hour?
5 shirts =20 minutes
Multiply both by 3 to get to 60 minutes
15 shirts= 60 minutes
15 shirts per hour
6. Rate vs. Unit Rate
A rate is a ratio that is used to compare different kinds of
quantities.
A unit rate describes how many units of the first type of
quantity corresponds to one unit of the second type of quantity.
http://www.brainingcamp.com/resources/math/rate/lesson.php
Rate: 60 miles in 3 hours
Unit Rate: 20 miles in 1 hour
7. Put decimals in order from least to greatest:
1.506, 1.56, 0.8
.8, 1.506, 1.56
8. What is the difference between these numbers? Put them in order
from least to greatest.
l-1l, l9l, l-15l, -7
The numbers between the lines are representing ABSOLUTE VALUE.
-7, 1, 9, 15
9. Graphing Equations:
y = 2x - 1
What numbers could possibly represent y and x?
Ex: y= 3 and x=2
3=2(2)-1
3=4-1
3=3
Write those numbers as coordinate pairs:
(x,y)
(2,3)
10. Greatest Common Factor
What is the GCF of 12 and 30?
6
11. Ratios
http://www.thinkingblocks.com/thinkingblocks_ratios/tb_ratio_main.html
12. Ordering Fractions