Study Percent Problems In Context in ISEE Middle Level Quantitative Reasoning with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
All flashcards
Flashcard 1: A 40-item quiz has 85% correct. How many were correct?
Answer: 34. Multiply 40 by 0.85 to determine the number of correct answers.
Flashcard 2: A number is increased by 30%. What is the multiplier on the original?
Answer: 1.30. Add 1 to the decimal 0.30 to get the factor for a 30% increase.
Flashcard 3: A shirt costs $50 and is discounted 20%. What is the sale price?
Answer: $40. Subtract 20% of $50 from the original price to get the discounted amount.
Flashcard 4: A price decreases from $90 to $72. What is the percent decrease?
Answer: 20%. Divide the $18 decrease by the original $90 and multiply by 100.
Flashcard 5: Find the original amount if 8% of it equals 12.
Answer: 150. Divide 12 by 0.08 to solve for the whole amount.
Flashcard 6: What percent of 80 is 12?
Answer: 15%. Divide 12 by 80 and multiply by 100 to express the ratio as a percentage.
Flashcard 7: What is 15% of 60?
Answer: 9. Convert 15% to 0.15 and multiply by 60 to find the part of the whole.
Flashcard 8: A $400 bill is split so one person pays 35%. How much do they pay?
Answer: $140. Multiply $400 by 0.35 to find one person's share.
Flashcard 9: A population of 500 grows by 12%. What is the new population?
Answer: 560. Multiply 500 by 1.12 to account for the 12% growth.
Flashcard 10: After a 10% discount, a jacket costs $72. What was the original price?
Answer: $80. Divide $72 by 0.9 to find the price before the 10% discount.
Flashcard 11: If 25% of a number is 18, what is the number?
Answer: 72. Divide 18 by 0.25 to solve for the whole when given 25% of it.
Flashcard 12: A price increases from $40 to $50. What is the percent increase?
Answer: 25%. Divide the $10 increase by the original $40 and multiply by 100.
Flashcard 13: A bill is $80 before tip. What is a 15% tip amount?
Answer: $12. Multiply $80 by 0.15 to calculate the tip based on the bill.
Flashcard 14: A store sells 45 of 60 items. What percent of the items were sold?
Answer: 75%. Divide 45 by 60 and multiply by 100 to get the percentage sold.
Flashcard 15: A test score improves from 70 to 84. What is the percent increase?
Answer: 20%. Divide the 14-point increase by the original 70 and multiply by 100.
Flashcard 16: A class has 24 students; 75% are present. How many are present?
Answer: 18. Multiply 24 by 0.75 to find the number of present students.
Flashcard 17: A 6% sales tax is added to $200. What is the total cost?
Answer: $212. Add 6% of $200 to the original cost for the total including tax.
Flashcard 18: A $120 item is marked up 25%. What is the new price?
Answer: $150. Multiply $120 by 1.25 to apply the 25% markup.
Flashcard 19: A number is decreased by 18%. What is the multiplier on the original?
Answer: 0.82. Subtract 0.18 from 1 to get the factor for an 18% decrease.
Flashcard 20: State the percent equation that relates part, whole, and percent p.
Answer: part=100p×whole. This formula calculates the part by converting the percent to a decimal and multiplying by the whole.
Flashcard 21: State the formula for finding percent p given part and whole.
Answer: p=wholepart×100. This formula finds the percent by dividing the part by the whole and multiplying by 100.
Flashcard 22: State the formula for percent change from old to new value.
Answer: oldnew−old×100%. This formula computes the percentage change relative to the original value.
Flashcard 23: Find and correct the error: 30% of 50 is computed as 0.30+50=50.30.
Answer: Correct: 0.30×50=15. The error is adding instead of multiplying; percentage requires multiplication by the decimal.
Flashcard 24: A solution is 20% salt by mass. In 250 g, how many grams are salt?
Answer: 50 g. Multiply 250 g by 0.20 to calculate the mass of salt.