Title: Unit 5 Quiz
Course: Technical Math for Industry

Q: What percent of this grid is unshaded?
- 52% (Incorrect. This is the percent of the grid that is shaded. However, the question asked what percent is unshaded.)
- 48% (Correct. There are 48 unshaded squares out of a total of 100 squares. This is 48% of the grid.)
A: 48%
If wrong: Incorrect. This is the fraction of unshaded 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.
If wrong: Incorrect. without a percent symbol would represent the fraction of unshaded squares. Count the number of unshaded squares. You need that number with the % symbol.

Q: Write as a decimal and as a percent.
- 3.5 and 350% (Incorrect. You have put the decimal point in the wrong place. Notice that 100 is a multiple of 20. Multiply by to get . Now convert to a decimal and a percent.)
- 0.35 and 3.5% (Incorrect. , but this is not 3.5%. Move the decimal point two places to the right, not one place to the right, to find the percent.)
- 0.7 and 70% (Incorrect. , so and 0.7 are not equivalent quantities. Convert the fraction to hundredths, then find the equivalent decimal and percent.)
- 0.35 and 35% (Correct.)
A: 0.35 and 35%

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

75% of what number is 30?
- Percent = unknown, Amount = 30, Base = 75 (Incorrect. Ask yourself which number has the percent symbol. The amount is correctly identified.)
- Percent = 75%, Amount = unknown, Base = 30 (Incorrect. Ask yourself which number is the part and which is the whole. The percent is correctly identified.)
- Percent = 30%, Amount = 75, Base = unknown (Incorrect. Ask yourself which number has the percent symbol. The base is correctly identified.)
- Percent = 75%, Amount = 30, Base = unknown (Correct. The percent has the percent symbol. 30 is part of an unknown whole, so 30 is the amount, and the base is unknown.)
A: Percent = 75%, Amount = 30, Base = unknown

Q: What percent of 120 is 72?
- 86.4% (Incorrect. You may have solved the proportion , but the amount in this problem is 72. So the correct proportion is .)
- 60% (Correct. The equation for this problem is . The corresponding division is , so . Rewriting this decimal as a percent gives the answer.)
- 0.6% (Incorrect. You probably set up and solved the correct equation, but then you did not move the decimal point when converting to a percent.)
- 1.67% (Incorrect. You may have switched the base, 120, and the amount, 72, and solved the equation . The correct equation to solve is . Also, you did not move the decimal point when converting to a percent.)
A: 60%