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Introduction to measuring length (Standard units):

Learning objective: Students will be able to understand that length can be
measured accurately using standard units of measurement.

• In early days we used body parts to measure length. Those
measurements didn’t give the same result. Example: A child’s handspan
is smaller than the adult. So handspan, hand, foot and cubit are not
standard units of measurement.

• A measuring unit which is widely used to give accurate results is called a
standard unit.

• We can measure length using standard units of measurements such as
kilometre (km), metre (m), centimetre (cm) and millimetres (mm).

• 1 centimetre(cm) = 10 millimetres(mm)

1 metre(m) = 100 centimetres(cm)

1 kilometre(km) = 1000 metres(m)

• We measure very small lengths like the thickness of a needle, thickness
of our nail using millimetre.