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===Note for Teachers===
: Be careful not You may wish to refer avoid referring to a 30cm ruler as a foot ruler. 30cm is not exactly 1 foot, since 1 foot is 12 inches and there are 2.54 cm in 1 inch. This makes a foot 30.48cm.
==Key Stage 2==
===Meaning===
A '''ruler''' is a [[scientific instrument]] used to measure distance between objects or the length, width and height of an object.