Percent Decrease: Decimal to Percent

The video tutorial explains how to calculate percent decrease by converting decimals to percentages. It provides three examples: a swim team, a car's value, and gasoline prices. Each example uses the formula: (Original amount - New amount) / Original amount, then converts the result to a percentage by multiplying by 100. The tutorial emphasizes understanding the process of converting decimals to percentages to solve percent decrease problems effectively.

What is the first step in calculating the percent decrease?

• Add the new amount to the original amount.

• Divide the original amount by the new amount.

• Multiply the new amount by 100.

• Subtract the new amount from the original amount.

In the swim team example, what is the percent decrease when the number of students drops from 90 to 54?

• 50%

• 60%

• 40%

• 30%

How do you simplify the fraction when calculating the percent decrease in the car value example?

• By subtracting 100 from both the numerator and denominator.

• By adding 100 to both the numerator and denominator.

• By dividing both the numerator and denominator by their greatest common factor.

• By multiplying both the numerator and denominator by 10.

What is the percent decrease in the car's value from $30,000 to $12,000?

• 60%

• 40%

• 50%

• 70%

What is the percent decrease in gasoline price from $3.59 to $3.25?

• 11.2%

• 10.5%

• 9.47%

• 8.5%