On a standard ruler, 9 mm would be represented by a line that is approximately the width of a standard pencil lead. Each millimeter on a ruler is typically divided into smaller increments, such as tenths or half millimeters, depending on the ruler's scale. So, 9 mm would be slightly less than a centimeter, about a third of an inch.
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Oh, dude, 9 mm on a ruler is like super tiny. It's about the size of a small bug's leg, you know? So, if you're trying to measure something that small, good luck not squinting your eyes out!
23mm is about 9/10 of an inch. That's about halfway between 7/8 and 15/16
You cannot see 9.44 inches on a ruler. The inches are often - though not always - marked in tenths. 9 inches will be shown on the ruler. From there move four small units towards the 10 inch mark. That is 9.4 inches away from the 0. Slightly less than half a mark further along is 9.44 inches.
1 in = 25.4 mm (exactly) → 9/16 in = 9/16 × 25.4 mm = 14 23/80 mm = 14.2875 mm ≈ 14.3 mm
the 9th mark on a ruler in inches is 9/16 inches for centimeters its 9/10 cm.
My ruler is not that accurate, but it looks like 15/16 to me.