Percent of Error TeacherTwins©2014

Warm Up Find the percent of change. Tell if it is an increase or decrease. Round to the nearest percent. 1). New: $40 Original: $34 2). New: $76 Original: $150 3). New: $ 340 Original: $ 430 4). New: $20 Original: $ 2 18% increase 49% decrease 21% decrease 900% increase

How to Find Percent of Error Flippable How to Find Percent of Error Example Two Example Three Example One

Percent of Error- Comparing a guess or estimate to an exact value.  

Example 1: I thought 70 people would come to the concert, but in fact 80 did.   12.5 % error

Example 2: The report said the parking lot held 240 cars, but we only counted 200 parking spaces.   20%

Example 3: The weather report said we should get 20 mm of rain, but we only got 25 mm.   20%

Find the percent of error, round to the nearest whole percent. Practice. Find the percent of error, round to the nearest whole percent. 1). Kim thought she would get $50 for her birthday, but she got $75. What is the percent of error? 2). Stephen thought he would run 7 miles Monday morning, but he only ran 5. Find the percent of error. 3). Jan thought she would get 12 questions right on the test, but she only got 8 right. What is the percent of error? 4). Candi predicted her dog would have 6 puppies, but she had 7. Find the percent of error. 33% 40% 50% 14%

Explain how to find percent of error. Closure Explain how to find percent of error.