New
New
Year 3
Millimetres as a unit of measure and the relationship between them and cm
I can understand millimetres as a unit of measure and describe the relationship between mm and cm.
New
New
Year 3
Millimetres as a unit of measure and the relationship between them and cm
I can understand millimetres as a unit of measure and describe the relationship between mm and cm.
These resources will be removed by end of Summer Term 2025.
Switch to our new teaching resources now - designed by teachers and leading subject experts, and tested in classrooms.
Lesson details
Key learning points
- Small objects are measured in millimetres.
- There are 10 mm in 1 cm
Keywords
Millimetre - A millimetre is a standardised unit of measurement. We can abbreviate millimetre to mm.
Common misconception
Children may think that 10 mm are larger than 1 cm.
There are 10 mm in 1 cm. 1 cm is made up of 10 mm. 10 mm and 1 cm are equivalent in length.
Where possible, do this lesson practically using classroom 15 or 30 cm rulers where mm can be seen.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
Loading...
Starter quiz
Download starter quiz
6 Questions
Q1.
I have a piece of ribbon that is 80 cm long. Is this ribbon shorter or longer than one metre?
longer
Q2.
Which unit would you use to measure the length of a swimming pool?
mm
cm
kg
Q3.
Match the calculation to its answer.
10
80
50
6 x 10
10 x 2
10 x 10
Q4.
What is the length of this leaf?
Q5.
If one metre is equal to 100 cm, how many cm are 6 metres equal to?
Q6.
Convert the height of this house from centimetres to metres.
800 m
80 m
Exit quiz
Download exit quiz
6 Questions
Q1.
Which unit of measurement is represented by the shading and arrow in this image?
Centimetres
Metres
Q2.
Which of these objects would you measure in millimetres?
Length of a football pitch.
Height of a house.
Length of a desk.
Q3.
Which is smaller, one centimetre or one millimetre?
1 cm
Q4.
Is the pebble shorter or longer than 1 cm?
shorter
Q5.
Starting with the shortest, put these measurements in order of length.
Q6.
A piece of string is 90 mm long. 2 cm is cut off. What is the length of the piece of string now?