Title: Unit 5 Quiz
Course: Technical Math for Industry

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%
If wrong: 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.
If wrong: 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