Exploring Percent Change Concepts

The video tutorial covers the concept of percent of change, explaining it as a ratio comparing a new amount to an original amount. It details how to calculate percent increase or decrease using examples, emphasizing the importance of labeling the type of change. The tutorial includes a story problem and a practice problem to reinforce learning.

What is the percent of change if the new amount is greater than the original amount?

• Percent of decrease

• Percent of increase

• None of the above

• No change

What is the first step in calculating the percent of change?

• Identify the original amount

• Identify if the amount increased or decreased

• Calculate the new amount

• Set up the proportion

In the formula for percent of change, what do you put over the original amount?

• The percent of change

• 100

• The amount of change

• The new amount

If the original amount is 15 and the new amount is 12, what is the percent of change?

• 25% decrease

• 25% increase

• 20% decrease

• 20% increase

If the original amount is 4 and the new amount is 5, what is the percent of change?

• 25% decrease

• 25% increase

• 20% decrease

• 20% increase

Why is it important to label your answers as increase or decrease?

• To avoid confusion

• None of the above

• To make the answer look complete

• To follow the teacher's instructions

Bill paid $20 for a DVD three years ago and $15 yesterday. What is the percent of change?

• 20% increase

• 25% decrease

• 20% decrease

• 25% increase

The cost of a text message increased from 10 cents to 25 cents. What is the percent increase?

• 150%

• 250%

• 100%

• 200%

If you swam 50 meters in 28.38 seconds last month and 27.33 seconds today, what is the percent decrease?

• 3.5%

• 3.6%

• 3.7%

• 3.8%

When rounding to the nearest tenth of a percent, which digit do you look at?

• The thousandth place

• The hundredth place

• The ones place

• The tenth place