In the context of length, alone, there are centimetres and metres: cm = 0.01*m
centimetres and inches: cm = (1/2.54)*in
kilometres and miles: km = 1.609344*mile
Other units for length, for example: microns, millimetres, yards, chains, furlongs, lightyears, parsecs. And any pair will give an example of direct proportion.
You could then try the same exercise with measures of mass, or of energy etc. You need to ensure that the measures are absolute (that is, 1 unit is half as much as 2 units) so this will not work for temperature in the C or F scales.
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Proportions are used in real life to determine prices of things.
it is some wrods and maybe some numbers
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Speed and distance: the faster you go, the further you can go in a fixed amount of time.
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