If you can find any common factor of the numerator and denominator,
divide each of them by it.
If you're given 18/20, you stare at it for a while, and you notice that 18 and 20 have
the common factor of 2. So you divide top and bottom by 2, and you get 9/10. That's
the simplest form.
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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
Yes because 18 is 2*9 and 20 is 2*10.
Percentages are fractions over 100. So 45% is 45/100 You can then simplify that to 9/20
9/20, 18/40, 27/60
5/6, 10/12, 20/24