Percent Error

Percent Error

Oops, I was not that off, was I ?

Percent Error

• comparing the difference between the approximate & exact value to the exact value

• expressed as a percent (%)

Approximate & Exact values

• approximate is your best guess

• exact is the actual value after measuring or counting

Multiple Select

Which words also mean approximate? (check all that apply)

• guess

• exact

• estimate

• close to

Multiple Select

Which words mean exact? (Check all that apply)

• correct

• actual

• estimate

• precise

Absolute Value

• the distance from zero

• always positive

Multiple Choice

What is the absolute value of |9|?

• 0

• -9

• 9

Multiple Choice

What is the absolute value |-5|?

• -5

• 5

• 0

Calculate Percent Error

1. Find approximate value & exact value

2. Subtract on number side

3. Cross multiply and divide

Multiple Choice

A student estimated the weight of the package to be 35 pounds. After getting to the post office and weighing it, the actual weight was 22 pounds. First what is the approximate value?

• 35

• 13

• 22

• 57

Multiple Choice

A student estimated the weight of the package to be 35 pounds. After getting it to the post office and weighing it, the actual weight was 22 pounds. Next what is the exact value?

• 35

• 13

• 22

• 57

Multiple Choice

A student estimated the weight of the package to be 35 pounds. After getting to the post office and weigh in it, the actual weight was 22 pounds. What was the percent error?

• 35%

• 59%

• 22%