4.50 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 450/100 which can be simplified, if required.
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450/1 is.
To find the fraction of 1 tonne (1000 kg) that 450 kg represents, you would divide 450 kg by 1000 kg. This simplifies to 9/20, which is the fraction that 450 kg represents of 1 tonne.
It is: 450/2000 or 9/40 in its simplest form
450/1000
It is 5/4.