OOPS! MY BAD! By Catherine D.

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Presentation transcript:

OOPS! MY BAD! By Catherine D

Penny My guess was that the diameter of the penny was 16mm(1.6 cm) I had measured the penny and got 1.6cm. Using a proportion of 10mm over 1cm=Xmm over 1.6cm, solving it for 16mm. Then, I did some research and found that a penny is actually 19.05mm. So, now I had to find my percent of error.

Penny Continued First, I had to find the difference between the amounts, which was 3.05mm. Then, I divided 3.05 by 19.05 and got .1601 Finally , I rounded to the nearest tenth of a percent My final answer was 16% of error

Nickel My guess was that the diameter of the nickel was 20mm(2cm) I had measured the nickel and got 2cm. Using a proportion of 10mm over 1cm=Xmm over 2cm, solving it for 20mm. Then, I did some research and found that a nickel is actually 22mm. So, now I had to find my percent of error.

Nickel Continued First, I had to find the difference between the amounts, which was 2mm. Then, I divided 2 by 22 and got .0909 Finally , I rounded to the nearest tenth of a percent. My final answer was 9.1% of error

Quarter My guess was that the diameter of the quarter was 22mm(2.2cm) I had measured the quarter and got 2.2cm. Using a proportion of 10mm over 1cm=Xmm over 2.2cm, solving it for 22mm. Then, I did some research and found that a quarter is actually 24mm. So, now I had to find my percent of error.

Quarter Continued First, I had to find the difference between the amounts, which was 2mm. Then, I divided 2 by 24 and got .0833 Finally , I rounded to the nearest tenth of a percent. My final answer was 8.3% of error

Formulas I used The formulas I used were: Unit Conversions: 1cm=10mm Percent of Change: The amount of change divided by the original amount

Observations 1: In order to get the most accurate measurement, you need to make sure you are measuring in the center of the coin. 2: On the quarter, I had the lowest error between measurement and actual because it is such a big coin. 3: On the penny, I had the largest error because it is so small.