2. A percentage change is a way to express a change between the old value and the new one (which is the extent to which something gains or loses value.) Percent changes are useful to help people understand changes in a value over time.

3. PERCENT INCREASE WHEN THE VALUEE OF AN ITEM GOES UP PERCENT DECREASE WHEN THE VALUE OF AN ITEM GOES DOWN

4. Amount of change (subtraction) % (percentage of increase or decrease) Original amount (the original value of item) 100 (ALWAYS)

5. EXAMPLE Andrew works in a supermarket for $10.00 per hour. He now gets paid $12.00 per hour. Is this a percent increase or decrease?

7. WHAT IS HER PERCENT INCREASE IN PAY?

8. EXAMPLE The staff at a company went from 40 to 30 employees. Is this a percent increase or decrease?

10. WHAT IS THE PERCENT DECREASE IN STAFF?

11. Andrew works in a supermarket for $12.00 per hour. He was given a 4.5% raise due to his hard work and coming to work on time. What is his new pay?