To write fractions as numerals, place the numerator above the denominator and separate them with a line. For example, if we divided anything into three pieces, each would be "1/3," while the other two would be "2/3": He ate two-thirds of the pizza by himself! Fractions can also be expressed as sentences when there is no ambiguity about what part is being referred to. For example, "A quarter of my life has passed" or "One third of the movie was boring." Fraction sentences are easy to understand because you know exactly which part of the whole thing is being talked about. There are two ways to express 1/3 in a sentence: one is using the word fraction, the other using the phrase third. In mathematics, a fraction is any part of a whole. So, yes, 1/3 can be written as a fraction. It's just that there's no need for it since it can be expressed in another way that sounds like math jargon but means the same thing - third! Some examples of how 1/3 can be written in a sentence include: A quarter of his life had passed when he died. One third of the movie was boring. There were only three stars on this planet. As for how you write 1/3 in words, here are two options: one-third or one-third'.