A roller coaster at an amusement park rises to a height of 196 feet above the ground. So far, it has risen 36% of this height. To estimate the height the roller coaster has risen so far, Jake did the following. 1. Rounded 36% to 40% 2. Rounded 196 to 200 3. 10% of 200 is 20 4. 20 (4) = 80 5. 36% of 196 is about 80 However, Jake’s estimate was too high by almost 10 feet. Why was his estimate off by so much? He made a computation error. He rounded the percent up to 40% and the number up to 200. He made a rounding error, and should have rounded 196 down to 100. He should have rounded the percent down to 30% and the number down to 190.