Adding & Subtracting Percents of Quantity - solve each problem, round to the nearest hundredth

Sep 30, 2026

Uploaded by Kurz

Practice worksheet on adding and subtracting percents of quantity through 10 real-world word problems. Scenarios include a TV price increase, restaurant meal markup, a longer-lasting phone battery, a clothing discount after late delivery, reduced candy calories, total loan repayment with interest, plant height growth, mower price plus repair agreement, and thickness changes for cell phones. Answers are rounded to the nearest hundredth.

LanguageEnglish

CategoryExam

FormatPDF

Pages3

Reading Time8 min

AccessFree to download

Solve each problem

Round to the nearest hundredth

Answer key

Adding & Subtracting Percents of Quantity Name: | Solve each problem. Round your answer to the nearest hundredth.
1) An older TV screen was 49 centimeters wide. The newer model increased the screen size by 13% . How wide is the new TV screen? | | | | | Answers
1. | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2) At a restaurant a meal used to cost $12, but a new owner decided to raise the price by 14% . How much does the meal cost now? | | | | | 2.
3. | | | | | | | 3) An old cell phone battery would last for 16 hours. The new battery lasts 25% longer. How long will the new battery last? | | | | | 4.
5. | | | | | | | 4) Emily ordered a shirt online that cost her $22 total. The package arrived late so theseller took 30 percent off the price. How much did she end up paying? | | | | | 6.
7. | | | | | | | 5) A large candy bar was 131 calories. The smaller candy bar has 16 percent less calories. How many calories does the smaller candy bar have? | | | | | 8.
9. | | | | | | | 6) A loan company charged 45% interest on every dollar borrowed. If a person borrowed 166 dollars, how much would they end up paying total? | | | | | 10. | | | | | | | 7) A plant was 45 centimeters tall. After a month it had grown 13% taller. How tall was the plant after a month? | | | | | | | | | | | | 8) A store was selling lawn mowers for $57. The repair agreement is 9% of the price of the mower. How much would it cost for a mower and repair agreement? | | | | | | | | | | | | 9) The early version of a cell phone was 100 millimeters thick. The current version isabout 19 percent thinner. How thick is the newer version? | | | | | | | | | | | | 10) A furniture store had a chair that cost $40. After a few months the owner took 17 percent off the price. How much is the chair now? | | | | | | | | | | | | 1-10 | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 | 0 | [Math](Math www.CommonCoreSheets.com 7)[ www.CommonCoreSheets.com](Math www.CommonCoreSheets.com 7)[ 7](Math www.CommonCoreSheets.com 7) Adding & Subtracting Percents of Quantity Name: Answer Key | Solve each problem. Round your answer to the nearest hundredth. | | | | | 1. | | Answers
55.37 | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1) An older TV screen was 49 centimeters wide. The newer model increased the screen size by 13% . How wide is the new TV screen? | | | | | | | | | | | | | | | | | | | | | | | | | | 2) At a restaurant a meal used to cost $12, but a new owner decided to raise the price by 14% . How much does the meal cost now? | | | | | 2.
3. | | 13.68 | | | | | | | | | | | | | 20.00 | | | | | | | | | | | | | | | | | | | 3) An old cell phone battery would last for 16 hours. The new battery lasts 25% longer. How long will the new battery last? | | | | | 4.
5. | | 15.40 | | | | | | | | | | | | | 110.04 | | | | | | | | | | | | | | | | | | | 4) Emily ordered a shirt online that cost her $22 total. The package arrived late so theseller took 30 percent off the price. How much did she end up paying? | | | | | 6.
7. | | 240.70 | | | | | | | | | | | | | 50.85 | | | | | | | | | | | | | | | | | | | 5) A large candy bar was 131 calories. The smaller candy bar has 16 percent less calories. How many calories does the smaller candy bar have? | | | | | 8.
9. | | 62.13 | | | | | | | | | | | | | 81.00 | | | | | | | | | | | | | | | | | | | 6) A loan company charged 45% interest on every dollar borrowed. If a person borrowed 166 dollars, how much would they end up paying total? | | | | | 10. | | 33.20 | | | | | | | | | | | | | | | | | | | 7) A plant was 45 centimeters tall. After a month it had grown 13% tall

FAQs

How are answers supposed to be rounded on this worksheet?

Answers must be rounded to the nearest hundredth.

What types of situations are included in the percent problems?

The problems cover changes in size, price, time, height, calories, interest, and thickness using percent increases or decreases.

How do you handle a percent increase or decrease of a quantity in these problems?

Compute the new amount by applying the given percent change to the original value, then use the result asked for (new price, new size, new total, and so on).

Sep 30, 2026

Uploaded by Kurz