The answer depends on the ruler.
I have seen 0.15, 0.3, 0.9 and 1 metre rulers. They may well be others.
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Firstly, it is centameters. But, to answer your question, there are 30 cm on a normal sized ruler, and either 10 or 12 on a smaller one. Why do you ask?
1- a meter stick is like a giant ruler (it measures i meter)
You can't see it all at once on a ruler, and that's gotta be one heck of a ruler. 15 meters is a shade longer than 49 feet !
its a ruler that only has to do with meter measurement
The 6 cm mark is 0.06 meters.