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Number of
 
Mars bars with the same total weight as your whole class
Steps when walking at a leisurely pace for 1 hour
Stitches in a handknitted jumper
People at a cup final in a large stadium

Distance

You can hop in 5 seconds
From the top of a 6 storey building to the ground
The distance from the penalty spot to the goal on a football field
A car can drive on $1$cm$^3$ of fuel

Time

That a pet rat lives
For light to reach us from the nearest star other than the sun
Between two football world cups
For all of the red blood cells in your body to be replaced....10 times

Speed
 
Of a racehorse running at maximum speed
Of the fastest sprinter in the world
Of the fastest cyclist in an Olympic cycle sprint race
Of a bus going past the school

Mass 
 
Of a standard family car
Of a million cubic centimetres of water
Of a team of international male rugby players (15 players)
Of enough potatoes to make chips to feed everyone in the school for a week.

Area 
 
Of the sheets of paper in a ream (500 sheets) of A4.
Of the floor of the classroom
Covered by 5 litres of paint
Of fabric needed to make school uniforms for the whole class.

Volume of water
 
In a half-filled bath
Used in a 10 minute shower
Used in 5 dishwasher cycles
Used to flush the toilet 20 times