How many centmeters are in a ruler?

Answer 1

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.