Usually 30.
30 centimeters
you can get a ruler and measure the yard stick. 1 ruler (foot) is 30 centimeters so 30 x 3 (the ruler goes into the yard stick 3 times) is 90.
Depends how long the ruler is obviously. But if you are talking about a meter stick (very close in size to a yard-stick) then it is 100 cm.
ruler or meter stick
A meter stick
A 1 meter stick. 1 meter=100cm.
* Yard stick * Ruler * Protractor * Centimeters
A ruler,tape measure,meter stick.
For a small ruler . There are 15 cm in 1 ruler. wheras a big ruler has 30 cm in a ruler.
100
A standard metric ruler is just slightly longer than 30 centimetres and slightly longer than 12 inches.The "slightly longer" is for the extra bits of ruler that stick out in front of the 0 (zero) cm/in at the beginning of the ruler and behind the 30 cm/12 in mark at the end of the ruler
30.48 cm