Most of the time, it is not possible to draw objects to their real size.

We use scale drawings instead to accurately represent the object.

 

How to draw scale drawings
To make sure the drawing is still in proportion, we divide every length in real life by the same number to obtain the scale drawing length.

For example, suppose an architect wants to draw on paper a room that is 5m by 4m.

We can divide both 5m (500 cm) and 4m (400cm) by 100, which gives 0.05m (5cm) and 0.04 (4cm) - this is a much more appropriate size to draw with.

Since, we have divided both lengths by the same number, the scale drawing will still be in proportion (all lengths have reduced in size by the same amount).

To show that we have scaled down by a factor of 100 we would write 1:100

This means, for every 1 unit we have in the drawing, it represents 100 units in real life. So the real life object is 100 times bigger.

Remember, when scaling up or down to take care in the units you are using, a scale of 1:50 in cm means 1cm on paper represents 50cm or 0.5m in real life!

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