Measuring with a ruler not starting at zero, in inches

An example figure from the Length Reading Generator.

A 6 inch ruler marked in quarter inches with a metal cylinder lying along it from 1 inch to 3 1/2 inches, with magnified views of both ends — A 6 inch ruler marked every quarter inch, with a metal cylinder lying along it from the 1 inch mark rather than 0. Magnified views show its left end on 1 inch and its right end on 3 1/2 inches, so students subtract to find its length.

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Answer key

Left end: 1 in
Right end: 3 1/2 in
Length: 2 1/2 in

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