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Convert cm² to mm²

In this worksheet, students will convert areas given in cm² to mm².

'Convert cm² to mm²' worksheet

Key stage:  KS 2

Year:  Year 4 Maths worksheets

Curriculum topic:   Measurement

Curriculum subtopic:   Convert Units of Measure

Difficulty level:  

Worksheet Overview

This activity is about converting areas in cm² to areas in mm².


cm to mm


The diagram above shows a 1 cm square of area 1 cm2.
Each side is 1 cm or 10 mm long.

Each tiny square is 1 mm long and has an area of 1 mm2.

Ten of these tiny squares fit along each side.  There are 100 in total.

1 cm2 = 100 mm2


It is really important to understand that although the conversion factor between cm and mm is 10

(1 cm = 10 mm), the conversion factor between cm2 and mm2 is 100!



Change the area in cm² to an area in mm².


11 cm2




11 x 100 = 1,100 mm2


Are you ready to have a go at some questions now?


If you find this tricky, you can look at the introduction again by clicking on the red help button on the screen.


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