Digits, Grade 7, Volume 1, Homework Helper

### 9-5: TEKS Practice

• 1. If the original quantity is 10 and the new quantity is 13, what is the percent increase?

• 2. Craig likes to collect records. Last year he had 10 records in his collection. Now he has 12 records. What is the percent increase of his collection?

• 3. If the original quantity is 5 and the new quantity is 3, what is the percent decrease?

• 4. At noon, a tank contained 10 cm of water. After several hours, it contained 7 cm of water. What is the percent decrease of water in the tank?

• 5. Estimation Suppose the original quantity is 13 and the new quantity is 1.

• a. Which of these is the best estimate for the percent change?

• A. 50%

• B. 25%

• C. 100%

• D. 75%

• b. Is this an example of a percent increase or a percent decrease?

• 6. If the original quantity is 15 and the new quantity is 19, which of these is the best estimate for the percent change?

• A. 50% increase

• B. 100% decrease

• C. 75% increase

• D. 25% increase

• 7. Last year, the Debate Club had 7 members. This year there are 12 members in the club. Which of these is the best estimate for the percent change in the number of club members?

• A. 25% increase

• B. 100% decrease

• C. 75% increase

• D. 50% decrease

• 8. Jake ordered 23 large pizzas for a party. When the party was over he had 6 large pizzas remaining. Estimate the percent change in the number of large pizzas.

• A. 100% decrease

• B. 25% increase

• C. 50% increase

• D. 75% decrease

• 9.

• a. Writing If the original quantity is 25 and the new quantity is 50, what is the percent increase?

• b. Explain what operation is equivalent to finding this new quantity. Write the explanation as an expression.

• 10. Money A savings account increases from \$250 to \$270. What is the percent increase of the savings account?

• 11. Think About the Process Suppose the original quantity is 175 and the new quantity is 126.

• a. What expression represents the percent decrease?

• A. fraction 126 minus 175 , over 175 end fraction

• B. fraction 175 minus 126 , over 175 end fraction

• C. fraction 126 minus 175 , over 126 end fraction

• D. fraction 175 minus 126 , over 126 end fraction

• b. What is the percent decrease?

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