Hi, native English speaker here! Do you mean writing this out as you would say verbally? I would say the pattern "one third..... Fourth.... Fifth..." works except for 1/2. For 1/2 you could say "one half" or "half". Or it can be expressed as "fifty percent" I have never heard it as "one-second". For 1/4 you could say "a fourth" or "one-fourth" or sometimes this is called "a quarter". A quarter is also a coin worth 25 cents (which is 1/4 or a quarter of a dollar). Similarly.... 1/3 -> "a third" or "one third" Hope this was helpful and not overly confusing :)

When doing arithmetic, you would read this equation 1/2 + 1/4 = 3/4 as "one (or 'a') half plus one (or 'a') fourth equals three fourths". When talking about cutting a pizza, you would say "Bob gets half (of it), Sally gets a fourth (or 'a quarter') (of it), and I'll eat the rest."