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To convert metres to kilometres divide by 1000.

5000 m = 5000 ÷ 1000 = 5 km

4005 m = 4000 m + 00 5 m = 4 km 00 5 m

5030 m = 5000 m + 30 m = 5 km 30 m0 0

7234 m = 7000 m + 234 m = 7 km 234 m

MEASUREMENT OF LENGTH BY A RULER

A ruler has a length of 15 cm divided into 15 equal centimetres. To measure

smaller things we use ruler.

For example, to measure the length of a line segment, we place the zero mark of
the ruler on the left end of the line segment and the edge of the ruler along the

line segment. Then we read the mark of the ruler at the right end of the line

segment.

1 2 3 4 5 6 7 8 9 10 11 12

The length of the above line is 8 centimetre. It is also written as 8 cm.

USE TO DIFFERENT UNITS TO MEASURE DIFFERENT THINGS

To measure small things like pencil, notebook, etc. we use centimetre (cm). To

measure the length of cloth, room, etc. we use metre (m).
To measure distance between two cities we use kilometre (km). Some estimated

lengths are given below:

Length of an eraser/sharpener about 3 cm

Length of a pen about 10 cm or 15 cm

Length of a crayon about 6 cm

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Measurement
Mathematics-3