Using decimals, 20% = .2
9 x .2 - hard to do in your head, so instead do 9 x 2 = 18.
Then move the decimal point back where it goes.
1.8
Twenty percent of nine is 1.8.
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Expressed as a percentage, 20/45 x 100 = 44.4 recurring (that is, 44.4444...) percent.
9 percent of 20 = 1.89% of 20= 9% * 20= 0.09 * 20= 1.8
9/20 = 45%
9 out of 20 = 9/20 = 9 ÷ 20 = 0.45: 0.45 x 100 = 45%
20 percent of 45 = (20 / 100) x 45 = 9.