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You would use millimetres to measure a fly.

# Measures (Year 4)

In KS2 Maths, as you go through the years, you'll discover cool things about measuring. Imagine you have 2 litres of juice – that's the same as 2,000 millilitres! Year Four gets even more exciting with old measures like pints. You'll also learn to write measurements in different ways, like 2.5 metres as 2m 50cm.

When we talk about liquids, we use millilitres, centilitres, and litres – these are metric measures. But sometimes we use other ones like gallons or pints, and those are called imperial measures. There's more – miles for long trips, stones for weights, and inches for short distances instead of kilometres, kilograms, and centimetres.

Can you tell your litres from your pints? Take the fun quiz to test how much you know about measures!

1.
How many millimetres in one metre?
10mm
100mm
1,000mm
10,000mm
The prefix 'milli' means the same as 11,000
2.
How do we write 451cm in m?
0.451m
4.51m
45.1m
451m
Divide by 100 to convert centimetres to metres
3.
What is 6.45m expressed in metres and cm?
6m 45cm
64m 5cm
0m 645cm
645m 0cm
Here the numbers to the left of the decimal point are metres. The first two numbers to the right of the decimal point are cm. If there was a third number to the right of the decimal point then all three would be mm
4.
Which unit would you use to measure the length of a fly?
Kilometre
Millimetre
Centimetre
Metre
Flies are very small so mm would be best
5.
What is half of 1 metre in cm?
0.5cm
5cm
50cm
500cm
1m = 100cm so a half of 100 is 50
6.
What is one tenth of a litre in millilitres?
0.1ml
1ml
10ml
100ml
There are 1,000 ml in a litre so divide by 10
7.
Which of the following could be the weight of a small puppy, for instance a Chihuahua?
100g
10kg
100kg
50g
A larger puppy, such as a Great Dane, can weigh as much as 1kg at birth!
8.
10 millimetres is equal to?
1cm
10cm
100cm
1,000cm
1m = 100cm = 1,000mm
9.
Which of these statements is true?
Pint > 1 litre
Pint = 1 litre
Pint > 0.5 litre
Pint = 2 litres
A pint is slightly more than half a litre
10.
How many grams are equivalent to one quarter kg?
25g
250g
250.5g
2,500g
There are 1,000g in a kg so divide by 4