How should you write the length you measured?

Only the number

Only the unit

Number followed by the unit

Unit followed by the number

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Q1.

What is the SI unit of length?

Q2.

How many centimetres are there in one metre?

Q3.

Which smaller unit is equal to one-tenth of a centimetre?

Q4.

If a piece of paper measures 210 mm in width, how many centimetres is that?