While measuring the length of a pencil, one end is at 25cm and the other end at 0.92m. What is the length of the pencil in millimeters? What mistake is generally done in this question?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

Calculations should be done in the same units.

Converting 0.92 m into cm, we get 0.92 m = 92 cm

Length of pencil = Reading of second end - Reading of first end

                        = 92 - 25
 
                        = 67cm

But 1cm = 10mm

So, 67cm = 670 mm

The mistake that is generally done in such questions is that the various readings are not changed in the same units.

Answered by  | 4th Jun, 2014, 03:23: PM