Title: M1.1-2 Percent Quiz
Course: Technical Math for Industry > Section: Module 1.1 Ratio Proportion & Percents

Q: What percent of this grid is shaded?
- 14% (Correct. There are 14 shaded squares out of a total of 100 squares. This is 14% of the grid.)
- 86% (Incorrect. This is the percent of the grid that is unshaded. However, the question asked what percent is shaded.)
A: 14%
Feedback: Incorrect. This is the fraction of shaded squares, which is a different way of giving the same information. Percent means "per 100." Writing a percent means writing how many parts out of 100 you are counting.
Feedback: Incorrect. without a percent symbol would represent the fraction of shaded squares. Count the number of shaded squares. You need that number with the % symbol.

Q: Write 760% as a decimal and as a simplified fraction.
- 0.76 and (Incorrect. Move the decimal point in the whole number 760 two places, not three, to the left. is equivalent to this incorrect decimal.)
- 7.6 and (Incorrect. You may have found the correct decimal 7.6 and then divided the 6 by 100. Because the 6 is in the tenths place, the decimal part would be equal to , which simplifies to .)
- 76,000 and (Incorrect. Move the decimal point in the whole number 760 two places to the left, not to the right, to find the decimal. The mixed number is correct, but this does not equal 76,000.)
- 7.6 and (Correct. Move the decimal point in the whole number 760 two places to the left to find the decimal 7.6.)
A: 7.6 and

Q: Identify the percent, amount, and base in this problem.

What is 90% of 70?
- Percent = 70%, Amount = unknown, Base = 90 (Incorrect. Ask yourself which number has the percent symbol. The amount is correctly identified.)
- Percent = unknown, Amount = 90, Base = 70 (Incorrect. Ask yourself which number has the percent symbol. The base is correctly identified.)
- Percent = 90%, Amount = 70, Base = unknown (Incorrect. Ask yourself which number is the part and which is the whole. The percent is correctly identified.)
- Percent = 90%, Amount = unknown, Base = 70 (Correct. The percent has the percent symbol. The amount is part of the whole (base), which is unknown. The base is the whole amount, or 70.)
A: Percent = 90%, Amount = unknown, Base = 70

Q: 180% of what number is 18?
- 0.1 (Incorrect. You may not have correctly changed 180% to the decimal 1.8 when setting and solving the equation. The correct equation to solve is .)
- 10 (Correct. The equation for this problem is . The corresponding division is , so .)
- 32.4 (Incorrect. You may have mistaken the base for the amount and solved the equation . The correct equation to solve is .)
- 1,000 (Incorrect. You may have solved the proportion , but the percent is the amount out of 100 and the amount is 18. So the correct proportion is .)
A: 10

Q: If there’s a dress we like for  $50, and it’s 20% off, identify the amount off and the sales price.
- Percent = $10, Sales Price = $40 (Correct The amount off is the percentage part of the whole (base), which is $10.00. The sales price is $40.)
- Percent = $20, Sales Price = $30 (Incorrect. Ask yourself if you have calculated the percentage part of the whole (base) correctly. The sales price amount is incorrectly calculated.)
- Percent = 80%, Sales Price = $40 (Incorrect. Ask yourself if you have calculated the percentage part of the whole (base) correctly. The amount is correct but could not be correctly calculated using the calculated percent.)
- Percent = $20, Sales Price = $40 (Incorrect. Ask yourself if you have calculated the percentage part of the whole (base) correctly. The amount is correctly identified but cannot be correctly calculated due to the identified percent amount)
A: Percent = $10, Sales Price = $40

Q: If we need to add on 8.25% sales tax to a $50 item, what is the final cost?
- $54.13 (Correct. The total price is $50 + (8.25% × 50) = $50 + (.0825 × 50) = $50 + $4.125 = $54.125 = $54.13.)
- $4.125 (Incorrect. The total price is $50 + (8.25% × 50) = $50 + (.0825 × 50) = $50 + $4.125 = $54.125 = $54.13.)
- 50.4125 (Incorrect. The total price is $50 + (8.25% × 50) = $50 + (.0825 × 50) = $50 + $4.125 = $54.125 = $54.13.)
- 58.25 (Incorrect. The total price is $50 + (8.25% × 50) = $50 + (.0825 × 50) = $50 + $4.125 = $54.125 = $54.13.)
A: $54.13

Q: A pair of shoes are on sale for 30% off.  The sale price is $62.30.  What was the original price?
- $89 (Correct The correct way to calculate the cost is which is)
- $79 (Incorrect The correct way to calculate the cost is which is)
- $67.30 (Incorrect The correct way to calculate the cost is which is)
- $98.70 (Incorrect The correct way to calculate the cost is which is)
A: $89

Q: What is 20% of 120?
- 24 (Correct)
- 20 (Incorrect)
- 88 (Incorrect)
- 76 (Incorrect)
A: 24

Q: 100 is what percentage of 200?
- 50 (Correct)
- 10 (Incorrect)
- 40 (Incorrect)
- 100 (Incorrect)
A: 50

Q: 200 is 50% of what number?
- 400 (Correct)
- 1000 (Incorrect)
- 500 (Incorrect)
- 100 (Incorrect)
A: 400