Part / Percent / Whole
What is the percent proportion?
Part / Whole = Percent / 100
What is the percent equation?
Part = Percent * Whole
What is the Simple Interest Formula
Interest = Principle * Rate * Time
How do you calculate percent of change?
Amount of change / original amount
How do you calculate percent of error?
Amount of Error / Actual (correct) Amount
What is 45% of 122?
54.9
Jimmy has $40 saved up for a new bike. If the bike Jimmy wants is $320 dollars, what percent of the money has Jimmy currently saved?
12.5%
Olivia took out a small loan to pay off some bills that had a higher interest rate. If she borrowed $3,000 at 2.5% and has 2 years to pay off the loan, how much will she pay in interest when finished?
$150
What does percent of change need to include when you give an answer?
Increase or Decrease
Maria guessed that a watermelon weighed 14 pounds. When it was placed on the scale, it actually weighed 16 pounds. What is the amount of error in Maria’s estimate?
2 pounds
23 is what percent of 176? Round to the nearest whole percent.
13%
Francis went to the store and spent $147.55 worth of groceries. If the sales tax in her county is 5.2% how much did Francis pay in tax for her groceries?
$7.67
When Barry was born his grandma and grandpa put $1500 into a savings account that earns him 1.25% interest but he cannot access the money until his 18th birthday. If no new money is ever invested, then how much will he have when he turns 18?
$1837.50
A laptop originally cost $800. It is now on sale for $680.
15% decrease
A student estimated that the classroom was 30 feet long. After measuring, the actual length was 27 feet. What is the amount of error in the student’s estimate?
3 feet
54 is 35% of what number?
Round your answer to the nearest tenth
154.3
Wilbur recently went out to eat with his family for his birthday. The meal cost him $124.72 before tax. The tax rate where he lives is 6.8% and he then left a 20% tip. How much was the total bill?
$159.84
Ashley loaned her daughter some money, with the understanding she would pay her back the loan in 4 years and give her 8% interest. At the end of the 4 years she received $160 in interest. How much did Ashley loan her daughter?
$500
Last year, a town had 2,500 residents. This year, it has 2,750 residents. What is the percent change?
10% increase
A package was predicted to weigh 8.5 kg. The first set of items in the box weighed 5.2 kg. Additional items were added later that weighed 4.6 kg. What is the amount of error to the nearest percent?
13%
Billy missed about 12% of the 24 problems on his most recent quiz. To the nearest whole, how many problems did Billy get correct?
21
Cynthia has been saving for months to go buy a PS5. She was excited to learn that the system, which originally cost $399.99 was on sale for 15% off at her local department store. Tax for her region is 8.2%. Can she buy the system with the $360 dollars she currently has saved?
No. She is $7.87 short, so hopefully in a week she will do some chores and get the system before it goes off sale. :)
Becky was in a jam, and really needed to pay off some tickets to avoid further fines and possibly jail time. She didn't like the idea, but she had to go to a PayDay loan store to get a loan. She borrowed $1000 that had an interest rate of 300% and she had 1 month to pay the loan off. How much did Becky have to pay off for this loan?
$1250. A $250 interest for only one month! Try to avoid these places at all costs! (see what I did there!?!?!) :)
After one year a streaming service subscription increased from $12 per month to $15 per month. The following year the price increased again to $20 per month. What percent has the price changed in the time subscribed? Give your answer to the nearest percent.
67%
A weather app predicted the temperature.. The app had an error of 5%. The actual temperature was 80 degrees. What are the two possible predictions the app gave? Round to the nearest whole degree.
84 degrees or 76 degrees. Remember to find this, find 5% of 80, then add the amount to 80, and subtract the amount to 80.