Percent Change and Error

Rob's text book says the density of an object is .83. He does an experiment and his result is .86. What is his percent error?

Lou predicts tomorrow's temperature will be 72 degrees. It only reaches 66 degrees. What was his percent error?

Meg estimated the weight of a rock to be 21 grams. When she weighed the rock, it was actually 23 grams. What was her percent error?

Tim guessed he had 650 football cards. When he counted, he actually had 548. What was his percent error?

Rick predicted he would score a 78 on his math quiz. He actually achieved an 84. What is his percent error?

Calculate the percent change from 83 degrees to 75 degrees.

Calculate the percent change from 73 feet to 79 feet.

Calculate the percent change from 73.4 miles to 65.2 miles.

Calculate the percent change from 34 minutes to 48 minutes.

Calculate the percent change from $323 to $542.