Percent Review
Flashcard
•
Mathematics
•
7th - 8th Grade
•
Practice Problem
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a percent?
Back
A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.
2.
FLASHCARD QUESTION
Front
How do you calculate a percentage of a number?
Back
To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 * 0.20 = 10.
3.
FLASHCARD QUESTION
Front
What is the formula to find the original price after a discount?
Back
Original Price = Sale Price / (1 - Discount Rate). For example, if the sale price is $127.46 after a 15% discount, the original price is $127.46 / (1 - 0.15) = $149.95.
4.
FLASHCARD QUESTION
Front
How do you find the percent error?
Back
Percent Error = |(Estimated Value - Actual Value)| / Actual Value * 100%. For example, if the estimated value is 350 and the actual value is 210, Percent Error = |(350 - 210)| / 210 * 100% = 66.67%.
5.
FLASHCARD QUESTION
Front
What is the formula for simple interest?
Back
Simple Interest = Principal x Rate x Time. For example, if you borrow $6500 at an 8% interest rate for 5 years, the interest is $6500 * 0.08 * 5 = $2600.
6.
FLASHCARD QUESTION
Front
What does it mean if 64 is 40% of a number?
Back
It means that 64 is 40% of the total number. To find the total number, use the formula: Total Number = Part / Percent. Here, Total Number = 64 / 0.40 = 160.
7.
FLASHCARD QUESTION
Front
How do you convert a percentage to a decimal?
Back
To convert a percentage to a decimal, divide by 100. For example, 25% as a decimal is 25 / 100 = 0.25.
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