Find a common factor of the numerator and denominator and divide both by that number. Repeat until the only common factor is 1.
You can do that in one step if you start with the Highest Common Factor (HCF).
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If your working with fractions then you can't simplify it so it is 13/20 . And if it isn't fractions then it is 6.5/10
They are: 7/20 = 14/40 = 21/60
7/10 = 14/20
14/20 is one example.
Percentages are fractions over 100. So 45% is 45/100 You can then simplify that to 9/20