Question 1: Convert 0.75 to a percentage by multiplying by 100. Write your answer.

Answer: 75%

Question 2: Express 0.086 as a percentage.

Answer: 8.6%

Question 3: A fruit costs $2.45. What percentage increase is there if the price increases to $2.75? Show your working.

Answer: Percentage increase = ((2.75 - 2.45)/2.45)×100 = (0.30/2.45)×100 ≈ 12.24%

Question 4: Convert 0.0056 to a percentage.

Answer: 0.56%

Question 5: Calculate 0.09 × 100 and write the result as a percentage.

Answer: 9%

Question 6: A survey shows that 0.35 of students prefer online learning. Express this as a percentage.

Answer: 35%

Question 7: If a jacket originally costs $80 and is now marked down to $64, what percentage discount has been given? Show your working.

Answer: Discount = ((80 - 64)/80)×100 = (16/80)×100 = 20%

Question 8: What is 0.0023 expressed as a percentage?

Answer: 0.23%

Question 9: A test score of 0.87 is converted to a percentage. What is the score?

Answer: 87%

Question 10: A machine produces 0.0035 liters of oil per cycle. Express this amount as a percentage of 1 liter.

Answer: 0.35%

Question 11: An item originally costs $150. During a sale, it is discounted by 25%. What is the new price? Show your working.

Answer: Discount amount = 150×0.25 = 37.50; New price = 150 - 37.50 = 112.50

Question 12: Identify and correct the mistake: Converting 0.45 to a percentage gives 0.45%.

Answer: Incorrect, 0.45×100=45%, so the correct answer is 45%.