0.625 = 5/8" = 10/16" = 20/32" = 40/64"
so just over six and a half
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the 9th mark on a ruler in inches is 9/16 inches for centimeters its 9/10 cm.
It is 2.25 inches - whether on a ruler or on a measuring tape or whatever.
Whether on a ruler or anywhere else, it is still 1.35 inches. No ruler is graduated with at that level of detail. A tenth of an inch is typical. So you want a point halfway between 1.3 inches and 1.4 inches. Alternatively, you can draw a line of 1.35*2 = 2.7 inches (the ruler will measure that) and then bisect it.
1 ruler (12 inches) is 30.48cm
On a 12 inch ruler, the 1/3 point would be 12/3, or at 4 inches.