Percent of a Number
What is 10% of 50?
5
Find the percent change.
Original cost: $100
New cost: $59
41% decrease
Martin is a senior in highschool. He applied to 10 colleges last month. This month he applied to 7. What is the percent decrease in the number of colleges that Martin applied to this month?
(3/10) * 100 = 30
30% decrease in the number of colleges applied
What is 0.47 as a percent?
47 %
What is an amount of change expressed as a percent of the original amount.
Percent Change
What is 90% 0f 70
$580 *6.5% = $580 * .065 = 37.7= $37.70
Find the percent change:
Original value: 36
New value: 50
28% increase
Ruby's bank balance in January was $20,000. By December her balance increased to $25,000. What is the percent increase of Ruby's bank balance?
(5,000/20,000) * 100 = 25
25% increase in bank balance
What is 2/5 as a decimal?
0.4
What are percents?
A ratio comparing a number to 100.
What is 16% of 43 minutes?
6.88 minutes
Find the percent change:
Original value: 12
New value: 18
33% increase
Rob's total miles run this week increased from 5 miles to 14 miles. What is the percentage increase in the number of miles Rob ran?
(9/5) * 100 = 180
180% increase in number of miles
Convert 115.9% into a decimal
1.159
What is an amount of decreae expressed as a percent of the original amount.
Percent Decrease
The local burger place serves their burgers well-done or medium. The burger place served 95 burgers during lunch, 40% of which is well-done. How many well-done burgers did they serve?
0.4 x 95 = 38
38 burgers
Find the percent change:
Original value: 40
New value: 63
57.5% increase
Last year, a lighting supplier called Bright Idea shipped a total of 2,450 lamps to its distributors. This year, they shipped a total of 1,225 lamps. What is the percent decrease of the number of lamps shipped?
(1,225/2,450) * 100 = 50
50% decrease in the number of lamps shipped
Convert 0.008 to a percent.
0.8%
What is an amount of increase expressed as a percent of the original amount.
Percent Increase
Jackie ordered a set of brown and orange pins. He received 8,000 pins, and 80% of them were brown. How many brown pins did Jackie receive?
0.8 x 8000 = 6400
6,400 brown pins
Last year, Manuel gave 610 piano performances. This year, he gave 427 piano performances. What is the percent of decrease in the annual piano performances?
(183/610) x 100 = 30
30% decrease in piano performances
The price of gasoline rose from $3.50 to $3.71 in one week. By what percent did the gas price rise?
(0.21/3.50) * 100 = 6
6% increase in price of gasoline
What is 2 1/10 as a percent and decimal?
210% and 2.1
How do you calculate a percent change?
(amount of change/original value) x 100