100 cm
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1 ruler (12 inches) is 30.48cm
100 centimeters.
The old Imperial ruler was one foot long. To enable pupils to carry one in their "pencil box", a version that was half as long was introduced. 1 foot = 30.48 cm so rulers are graduated to 30 cm or half that length (= 15 cm).
There is no set length for a ruler, as they are produced in various sizes. The more common sizes are 15 cm, 30 cm and 100 cm There are two main methods to see what size your ruler is; a) Find another one that is longer than your own and measure the the length of yours using that one b) Look at the scale on your own ruler. The largest number there indicates the length.
There are 3 significant figures