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Question
Answer the following in short.
Which unit will you use to find the length of your notebook and why?
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Solution
Centimetre. Because a notebook has a length for which metre would be too large a unit to measure and millimetre would be too small.
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How can a measured length be expressed?
You are provided three scales A, B and C as shown in the following figure to measure a length of 10 cm.

For the correct measurement of the length you will use the scale
Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.
- Sam measured it with a half metre long thread.
- Gurmeet measured it with a 15 cm scale from her geometry box.
- Reena measured it using her hand span.
- Salim measured it using a 5 m long measuring tape.
Which one of them would get the most accurate length? Give reason for your answer.
