OOPS! My Bad! By: Ella W..

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Presentation transcript:

OOPS! My Bad! By: Ella W.

I Will Be Using: A Quarter A Half Dollar Eisenhower Dollar Coin

My Diameter Measurements: Quarter: 22 millimeters Half Dollar: 29 millimeters Eisenhower Dollar Coin: 37 millimeters Quarter: 24.26 mm Half Dollar: 30.61 mm Eisenhower Dollar Coin: 38.1 mm My Diameter Measurements: Actual Diameter Measurements:

Percent of Error: How to Find Percent of Error (example) Prediction: 2 cookies Actual Amount: 3 cookies Step 1: divide your prediction by the actual number. 2 ÷ 3 = 0.666666667 Step 2: Multiply that quotient by 100. (or move the decimal two places to the right) 0.666666667 x 100 = 66.6666667 Step 3: Subtract that product from 100. 100 – 66.6666667 = 33.3333333% of error of cookie prediction.

Using the Percent Error formula, I found the percentage errors of my measurements. Quarter Percent of Error: 9.3150561% Half Dollar Percent of Error: 5.259719% Eisenhower Dollar Coin: 2.8871391%

Observations It is not quite as easy as I thought to find an exact measurement. It makes it easier to do a problem if you write out the instructions first. When measuring something small, make sure the starting point of the ruler is right on the edge of the object.

Thank you for Watching!