Page 101 - Viva

Measurementement
7 Measur

Learning Outcomes
Students will be able to learn:

• about the need for standard units for measuring length.
• to measure lengths and distances using appropriate units like centimetre and metre.
• how to use measuring tools like scale or measuring tape.
• estimation of the length of various objects and distances and verification by actual
measurement.

• relationship between metre and centimetre.
• to weigh different objects in the environment using non-standard units.
• to measure and compare of the capacity of different containers using
non-standard units.
• about the conservation of volume.

Measuring Length Using Standard Units

Length is a form of measurement which we use to know how long, short, tall, far, etc.,
objects are.
We have learnt how to use body parts to measure length. But it is not accurate as the

length of body parts differs from person to person. To get an exact measurement, we need
a fixed length.
The basic unit for measuring length is metre. It is denoted by m.

We use centimetre to measure objects of shorter lengths. For example, the length of a
pencil box is measured in centimetres. It is denoted by cm. We use a ruler to measure
lengths in centimetres.

To measure lengths using a ruler, place the ruler on the object whose length is to be
measured such that the zero marking falls on one end of the object. Read the marking on
the ruler at the other end of the object. This gives the length of the object in centimetres.

Example 1: What is the length of the given pencil?

cm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

6 5 4 3 2 1 inch
Solution: The length of the given pencil is 10 cm.

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