Four children measures the length of a table which is about 2 m. Each of them uses different ways to measure it.
(i) Sam measures it with a half metre long thread.
(ii) Gurmeet measures it with a 15 cm scale from her geometry box.
(iii) Reena measures it using her hand span.
(iv) Salim measures it using a 5 m long measuring tape.
Which one of them will get the most accurate length? Give reason for your answer.

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Solution

The length measured by Salim will be the most accurate because he is using a 5 m long measuring tape which is longer than the table. So, he can measure the length of the table in one go accurately. While in the other cases the chance of making an error is higher due to multiple measurements. Reena is using her hand span which is not a standard unit of measurement and leads to inaccurate measurement of length. In case of Sam, only that lengths can be measured which are exact multiples of half a metre.

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Use the following information to answer the next question.

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Question 3

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