A millimetre is a standardised unit of measurement.  We can abbreviate millimetre to mm. 

A centimetre is a standardised unit of measurement.  We can abbreviate centimetre to cm.

The difference is the result of subtracting one number from another.

Measuring length and height using cm and mm

Maths

In this unit pupils will continue to measure using appropriate tools and units progressing to using a wider range of measures including comparing and using mixed units In the future unit pupil will learn perimeter as the distance around the edge of a 2D shape They will learn perimeter is measured in units of length found by counting units and by calculating by adding the side lengths of a 2D shape

In the prior unit pupils chose, used and compared appropriate standard units to estimate and measure length/height, mass, temperature, capacity to the nearest appropriate unit. In this unit pupils will continue to measure using appropriate tools and units progressing to using a wider range of measures, including comparing and using mixed units.

Measuring length and recording in tables

Which of the following would be good to measure in millimetres (mm)?

Match the unit of measure to its abbreviation.

What number of mm is the arrow pointing to?

Give the height of this cake in whole cm and mm.

Match the object to the unit that would be used to measure it.

Starting with the shortest, put these units of measure in order.

Is the pebble longer or shorter than 1 cm?

Starting with the shortest, put these measurements in order of height.

A piece of string is 100 mm long.  5 cm is cut off.  What is the length of the piece of string now?

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