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80% = 4 fifiths
They denote different fractions of the inch. A good engineers ruler will have 64 ths, 32 nds 16 ths and 8 ths at least.
4/84 = 1/21
6/8
That is 7/10 ths of an inch, a little less than 3/4.That is 7/10 ths of an inch, a little less than 3/4.