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On a standard ruler, .8 inches is slightly less than one inch. It is located just a bit before the first full inch mark, specifically eight-tenths of the way between the 0 and 1-inch marks. If you look closely, you’ll see that it falls between the eighth and ninth small hash marks, as each small mark typically represents one-tenth of an inch.
See if you can find a part of the ruler where there are 9 little marks between the inch divisions: that section of the ruler may be marked as "10ths" or "TENTHS". Each of the gaps between these marks is 0.1 inch so you want 8 gaps.
On a standard ruler, 7.9 inches would fall between the 7-inch mark and the 8-inch mark. Each inch on a ruler is divided into 16 equal parts, so 0.9 inches would be just slightly before the 1-inch mark after the 7-inch mark. To locate 7.9 inches precisely, you would count 7 full inches and then estimate just under a tenth of an inch beyond the 7-inch mark.
1/8 = 2/16 = 4/32 = 8/64
It's between 9/16 and 5/8