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Diagnose a Ruler or Scale-Reading Error
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ParaPro
PPM.168 Diagnose a Ruler or Scale-Reading Error
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A line ends halfway between 3/4 inch and 1 inch. A student records 3/4 inch because that is the last labeled fraction before the endpoint. Which explanation best identifies the error?
A
The student used the lower labeled mark instead of estimating the position between 3/4 inch and 1 inch.
B
The student counted endpoint tick marks rather than intervals.
C
The student measured from the 3/4-inch mark instead of zero, under the stated conditions, based on the given work.
D
The student read centimeters as inches.
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