1.29 in words is: one and twenty-nine hundredths.
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Oh, dude, writing numbers in words? That's like, so 1990s. But fine, if you must know, you write 1.29 as "one point two nine." There you go, you happy now?
129 hundredths in decimal form = 129/100 = 1.29
129% = 1.29
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.
-0.258 as a fraction in its simplest form is -129/500
That's literally all there is to it! 129/1000 as a decimal is 0.129.