Expressed as a mixed number in its simplest form, 1.29 is equal to 1 29/100 or one and twenty-nine hundredths.
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2.58 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. And, being a decimal fraction, it is in its simplest decimal form. Its equivalent, in rational form, is 129/50.
258 percent as a fraction in simplest form is 129/50
-129/500
It is: 0.0129 = 129/10000
0.645 = 645/1000 = 129/200