Exploring Percent of Change and Proportions

What is the basic formula for calculating the percent change?

• Change divided by the new number, multiplied by 100

• New number divided by the change, multiplied by 100

• Original number divided by the change, multiplied by 100

• Change divided by the original number, multiplied by 100

What is the first step in calculating the percent change?

• Multiply the original number by 100

• Subtract the original number from the new number

• Divide the new number by the original number

• Add the original number to the new number

In the example where Chris's height increased, what was the percent change?

• 10%

• 6.7%

• 4%

• 8.5%

If Jenna's teeth decreased from 32 to 25, what was the percent change?

• 18% decrease

• 21.9% decrease

• 21.9% increase

• 18% increase

In the example where Chris's height increased, what was the original height?

• 64 inches

• 58 inches

• 60 inches

• 62 inches

What was the percent change in JR's test scores from 66% to 30%?

• 54.5% increase

• 36% decrease

• 54.5% decrease

• 45.5% increase

What is the percent change if a number increases from 9.8 to 12.1?

• 22% increase

• 25% increase

• 20% increase

• 23.5% increase

What was the percent change in the population from 1790 to 2000?

• 6000%

• 7062.3%

• 5000%

• 7000%

How much did the number of drive-in movie theaters decrease from 1967 to 1997?

• 90.2%

• 75.5%

• 85.3%

• 81.7%

If the new cost of tuition is $33,408 after a 5.4% increase, what was the original cost?

• $33,000.00

• $30,000.00

• $32,000.00

• $31,696.39