Calculating Percent Decrease

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Cierra Henderson, MBA |
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Cierra is an educational consultant and curriculum developer who has worked with students in K-12 for a variety of subjects including English and Math as well as test prep. She specializes in one-on-one support for students especially those with learning differences. She holds an MBA from the University of Massachusetts Amherst and a certificate in educational consulting from UC Irvine.
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| Attempts: 14 | Questions: 15 | Updated: Jan 20, 2026
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1) A toy’s price decreased from $50 to $40. What is the percent decrease?

Explanation

Decrease = 50 – 40 = 10. (10 ÷ 50) × 100 = 20%.

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About This Quiz
Calculating Percent Decrease - Quiz

Prices drop, quantities shrink — how do we measure it? In this quiz, you’ll solve simple one-step percent decrease problems with everyday numbers. Take this quiz to build your percent decrease basics.

2) The price of a book decreased from $20 to $15. What is the percent decrease?

Explanation

Decrease = 20 – 15 = 5. (5 ÷ 20) × 100 = 25%.

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3) If the price of a pen decreases from $10 to $8, the percent decrease is 25%.

Explanation

Decrease = 10 – 8 = 2. (2 ÷ 10) × 100 = 20%, not 25%.

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4) The number of apples in a basket decreased from 60 to 45. What is the percent decrease?

Explanation

Decrease = 60 – 45 = 15. (15 ÷ 60) × 100 = 25%.

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5) A class had 50 students last year. This year it has 40. What is the percent decrease?

Explanation

Decrease = 10. (10 ÷ 50) × 100 = 20%.

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6) A phone’s price was $400, and it decreased by 30%. What is the new price?

Explanation

Decrease = 30% of 400 = 120. New price = 280.

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7) If a computer price decreases from $500 to $450, the percent decrease is 10%.

Explanation

Decrease = 50. (50 ÷ 500) × 100 = 10%.

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8) The number of books in a library dropped from 5,000 to 4,250. What percent decrease is this?

Explanation

Decrease = 750. (750 ÷ 5000) × 100 = 15%.

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9) A bicycle cost $250. It was reduced by 20%. What is the new price?

Explanation

Decrease = 20% of 250 = 50. New price = 200.

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10) A football team had 80 players, but now only 64 remain. What is the percent decrease?

Explanation

Decrease = 16. (16 ÷ 80) × 100 = 20%.

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11) The price of a TV was $600, but it was discounted by 15%. What is the new price?

Explanation

Decrease = 15% of 600 = 90. New price = 510.

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12) A factory produced 2,000 cars in 2022, but only 1,600 cars in 2023. What is the percent decrease?

Explanation

Decrease = 400. (400 ÷ 2000) × 100 = 20%.

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13) The cost of a laptop dropped from $1,000 to $800. The percent decrease is ___%.

Explanation

Decrease = 200. (200 ÷ 1000) × 100 = 20%.

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14) The population of a town decreased from 80,000 to 72,000. The percent decrease is ___%.

Explanation

Decrease = 8000. (8000 ÷ 80000) × 100 = 10%.

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15) A coat costs $120. If it is reduced by $24, what is the percent decrease?

Explanation

Decrease = 24. (24 ÷ 120) × 100 = 20%.

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Cierra Henderson |MBA |
K-12 Expert
Cierra is an educational consultant and curriculum developer who has worked with students in K-12 for a variety of subjects including English and Math as well as test prep. She specializes in one-on-one support for students especially those with learning differences. She holds an MBA from the University of Massachusetts Amherst and a certificate in educational consulting from UC Irvine.
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A toy’s price decreased from $50 to $40. What is the percent...
The price of a book decreased from $20 to $15. What is the percent...
If the price of a pen decreases from $10 to $8, the percent decrease...
The number of apples in a basket decreased from 60 to 45. What is the...
A class had 50 students last year. This year it has 40. What is the...
A phone’s price was $400, and it decreased by 30%. What is the new...
If a computer price decreases from $500 to $450, the percent decrease...
The number of books in a library dropped from 5,000 to 4,250. What...
A bicycle cost $250. It was reduced by 20%. What is the new price?
A football team had 80 players, but now only 64 remain. What is the...
The price of a TV was $600, but it was discounted by 15%. What is the...
A factory produced 2,000 cars in 2022, but only 1,600 cars in 2023....
The cost of a laptop dropped from $1,000 to $800. The percent decrease...
The population of a town decreased from 80,000 to 72,000. The percent...
A coat costs $120. If it is reduced by $24, what is the percent...
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