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.
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Every fraction is an equivalent fraction: each fraction in decimal form has an equivalent rational fraction as well as an equivalent percentage fraction.
A fraction that has a different sign to the first fraction.
Divide the fraction by 100, and you will get the percentage of a fraction.
Or both. That's a complex fraction.
The number below the fraction bar in a fraction is the denominator. The number above the fraction bar is the numerator.