A way to write decimal fractions like $1.333\dots$

fractions notation

You can do that by simply putting a bar on top of the decimal digits that repeat, for example, $\frac{1}{7} = 0.142857142857142857...$ which you can write $0.\overline{142857}$.

It's even better to write fractions like $\frac{3}{44} = 0.06\overline{81}$ which have repeating digits that don't start immediately after the dot.

You can find some other ways to write fractions on this website if you want (in section 1.4).

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