7.RP.3

7.RP.3

SWBAT use proportional relationships to solve multistep ratio and percent problems.

Multiple Select

Which of the following terms indicate an increase (adding) to an original number or amount?

• tax

• sale price

• amount off

• tip

• gratuity

Multiple Select

Which of the following terms indicate a decrease (subtraction) to an original number or amount?

• discount

• tax

• mark down

• gratuity

• sale price

​

​When a quantity increases or decreases, you can use number sense and proportional reasoning to compare the amount of change to the original amount. 

​

​What you must know, is to find the percent of a number.

Multiple Choice

What is 35% of 90?

• $$\frac{35}{90}$$  

• 3,150

• 31.5

• 0.3888888

Multiple Choice

What is 7% of 75?

• 0.7

• 525

• 0.093333

• 5.25

​​Calculating a percent change

• ​Step 1: Find the percentage of the original number.

• ​Step 2: Add or subtract the amount from step 1 to the original amount.

• ​Final answer

Multiple Choice

The population of cheetahs has decreased 30% over the last 18 years. If there were originally about 12,000 cheetahs, how many cheetahs are there now?

Will you add or subtract 30% of 12,000?

• add

• subtract

Multiple Choice

The population of cheetahs has decreased 30% over the last 18 years. If there were originally about 12,000 cheetahs, how many cheetahs are there now?

• 360,000

• 3,600

• 8,400

• 11,460

​​Calculating a percent change

• ​Step 1: Find the percentage of the original number.

• ​Step 2: Add or subtract the amount from step 1 to the original amount.

• ​Final answer

The population of cheetahs has decreased 30% over the last 18 years. If there were originally about 12,000 cheetahs, how many cheetahs are there now?​

​

• ​360,000

• ​3,600

• ​8,400

• ​11,60

Multiple Select

Robert is inspecting a shipment of 22-inch pipes. The lengths of the pipes may vary by 1%. What is the range of allowable lengths of the pipes? Select 2 (TWO) correct answers.

• 22.22

• 21.78

• 0.22

• 2.2

• none of these numbers are correct.

Poll

I feel comfortable calculating the percent of a number

• Strongly agree

• agree

• disagree

• strongly disagree

• neutral