Understanding Percent of Change

What is the formula for calculating the percent of change?

• Amount of change multiplied by the original amount, then divided by 100

• Original amount divided by the amount of change

• Amount of change divided by the original amount, then multiplied by 100

• Original amount multiplied by the amount of change

If Thomas scored 12 points in his first game and 18 in his second, what is the percent increase in his score?

• 100%

• 75%

• 50%

• 25%

Bridget answered 8 questions correctly on her first attempt and 14 on her final attempt. What is the percent increase in her score?

• 50%

• 60%

• 75%

• 80%

Samantha earned $42.50 in tips on her first day and $38 on her second day. What is the percent decrease in her earnings?

• 11.5%

• 10.6%

• 9.5%

• 8.5%

When calculating a decrease in percent of change, what is the first step?

• Add the new amount to the original amount

• Divide the new amount by the original amount

• Subtract the new amount from the original amount

• Multiply the original amount by 100