1.29 is already in decimal format
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129 hundredths in decimal form = 129/100 = 1.29
129% = 1.29
That's literally all there is to it! 129/1000 as a decimal is 0.129.
0.258 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, there is no simpler form. Its rational equivalent is 258/1000 which can be simplified to 129/500.
To find 20 percent of a number, multiply the number by 0.2. In this instance, 0.2 x 129 = 25.8. Therefore, 20 percent of $129 is $25.80. Don't forget to include two decimal places in your answer when referring to currency.