Compare it to a standard metre.
If you want a more precise method and have access to a well equipped lab, a metre is the length of the path travelled by light in vacuum in 1/299,792,458 of a second. That might be over-the-top, though!
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100cm
A meter stick is 100cm, therefore 20 pencils would fit on a meter stick.
Using a meter stick, measure out a meter. Then turn pi/2 radians according to the unit circle and measure out another meter.
to measure long distances
you can use a yard stick of a meter stick