Percent Change and Speed Calculations

Mr. Buffington explains percent increase and decrease, using equations to calculate percent change. He provides examples, including a simple increase from 20 to 25 and a decrease from 210 to 12. A word problem involving speed increase in a Batmobile is also solved, demonstrating the application of percent change in real-life scenarios.

What is the first step in calculating percent change?

• Divide the new amount by the original amount

• Subtract the original amount from the new amount

• Add the new amount to the original amount

• Multiply the original amount by 100

Which equation is used to find the percent change?

• Original amount divided by amount of change

• New amount divided by original amount

• Amount of change divided by new amount

• Amount of change divided by original amount

What is the formula to calculate percent change?

• (Original amount + New amount) / New amount * 100

• (New amount + Original amount) / Original amount * 100

• (Original amount - New amount) / New amount * 100

• (New amount - Original amount) / Original amount * 100

What is the result of dividing the amount of change by the original amount in percent change calculations?

• The amount of change

• The percent change

• The original amount

• The new amount

What is the final step in calculating percent change?

• Divide the new amount by the original amount

• Multiply the result by 100

• Add the original amount to the new amount

• Subtract the original amount from the new amount

What is the purpose of multiplying by 100 in the percent change formula?

• To convert the result into a percentage

• To find the amount of change

• To find the original amount

• To find the new amount

How do you calculate the amount of change?

• Original amount minus new amount

• New amount minus original amount

• Original amount plus new amount

• New amount plus original amount

What is the percent increase from 20 to 25?

• 20%

• 25%

• 30%

• 15%

What is the amount of change when going from 20 to 25?

• 4

• 6

• 3

• 5

What is the result of multiplying 0.25 by 100 in the percent change calculation?

• 20%

• 25%

• 35%

• 30%