The metre is divided into 100 equal parts. One hundredth part of a metre is called a centimetre (cm). So a hundred centimetres make one metre. Again a centimetre is divided into ten equal parts called millimetres (mm). 10 millimetres make 1 centimetre, 100 centimetres make 1 metre.

metric_ruler_scale

Now let’s look at a section of the rule between 4 cm and 5 cm.

reading_metric_rule

There are 10 equal divisions which are equal to 1/10 cm or 1 mm.
To measure 44 mm, first locate the longest line designated 4 cm or 40 mm.
Next count 4 additional lines to find 44 mm.

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Reading a metric ruler