Measure again and again!
 

You measured a 10 meter distance on the ground walked on it ten times, didn’t you?

Now do the following three exercises also -

Please measure the distance on the ground again with the paper tape - 3 to 5 times.

Did the distance turn out to be slightly long or short each time?

Please use a scale from your geometry set and use it to compare the centimetre marks drawn on the paper tape?

Do you notice any difference?

Please measure your scale with someone else’s scale? It will provide a good comparison if it is a different brand.

Sometimes, the scales may show a difference in the centimetre measure.

You have now discovered one of the most important aspects of measurement - Measurement carries the possibilities of errors also.

You can reduce them but you cannot get rid of the errors completely.

We need to be aware of errors in measurement and take steps to reduce them.

That is why -
 

1.  We repeat the measurement activity

2. Take care of the least count of the scale

3. Take care of other parameters that may affect the measurement activity