Find the Part
What is the formula used to solve for the Part?
whol e times percent divide 100
What is the formula used to solve for the Whole?
part divide percent times 100
What is the formula used to solve for the Percent?
part divide whol e times 100
What is the formula used to solve for Interest?
I=PRT
Interest=Pri ncipal times Rate times Time
If there are 24 hours during the day and the average student sleeps for 35% of the day, how many hours is the average student asleep for?
24 times 35 divide 100 =8.4 hours
What is 20% of 80?
16
80 is 20% of what number?
20 is what percent of 80?
25%
$500 accrues interest at an interest of 7% per year. How much interest is accrued in one year?
$500 times 7 divide 100 times 1 =$35
A video game is on sale. If the video game usually costs $40 and the video game was on sale for 20% off, how much is the price of the video game?
$32
What is the formula used to solve for the Part when considering percentage of decrease?
whol e - (whol e times percent divide 100)
What is the formula used to solve for the Whole when considering percentage of increase?
Part divide ((100+percent)divide100)
What is the formula used to solve for the Percent when considering percentage of change?
part divide whol e times 100 - 100
$500 accrues interest at an interest of 7% per year. How much interest is accrued in three years?
$500 times 7 divide 100 times 3 = $105
Percent of Error:
If an estimated ruler needs a percent of error less than 1%, how many inches can the estimated ruler be off by?
Hint: There are 12 inches on one ruler
12 times 1 divide 100 = 0.12
0.12 inches
If the price of a $70 item is on sale for 30% off, what is the price of the item?
$49
54 is 60% less than what number?
90
An item that cost $5 yesterday now costs $7. What is the percent of increase?
40%
$500 accrues interest at an interest of 7% per year. How much money will be in the account after three years?
$500 times 7 divide 100 times 3 = $105
$500 + $105 = $605
Adalyn took out a 2-year loan to buy a car at a 5% simple interest rate. If she has to pay $250 in interest, how much principal did she borrow?
P=I/(RT) times 100
P = 250 divide 5 divide 2 times 100
$2500
A meal costs Athan $23.50, plus 8% sales tax. How much did Athan pay in total?
$23.50 times 8 divide 100 = $1.88
$23.50 + $1.88 = $25.38
Jackson hikes 210 feet up a hill. If he is 60% of the way up, how tall is the mountain?
Solve for the WHOLE
210 divide 60 times 100 = 350
A kitten weighs 500 grams on its first visit to the vet. After a few weeks pass, the kitten now weighs 350 grams more than what it weighed before. What is the percent of increase from the first visit to the second visit?
500+350=850
850 divide 500 times 100 - 100 = 70%
70% increase
A loan of $700 was taken from a local bank. After 5 years, the amount owed back is $700, plus $70 back in interest. What was the annual interest rate for the loan?
($70)/($700) times100 divide5=2%
Jasmine estimates that a piece of wood measures 4.5 centimeters. If it actually measures 4.8 centimeters, what is the percent of error of Jocelyn's estimate?
Target divided by Actual time 100 minus 100
4.5 divide 4.8 times 100 -100 = 6.25%