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Discuss PGroot's answer to: How long is 7/8 on a ruler?

7/8 on a ruler must be 7/8 of an inch.  If you look at the marks, there's a mark for 1/2 inch halfway between the start and 1 inch.  Halfway between 1/2 and 1 is the mark for 3/4 inch.  Halfway between 3/4 inch and 1 inch is a mark for 7/8 inch.

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