These are decimal numbers, and dots above some of the digits make them recurring decimals. One dot means the digit under it repeats infinitely. In other words, it goes on forever (and ever and ever).

👉 Learn how to convert between decimals, fractions, and percentages. Numbers can be converted between decimals, fractions, and percents. To convert a number written in decimals to fractions, we write ...

As a supplement to the interesting properties of circulating decimal fractions which have been published in two recent numbers of NATURE, I give you the following, which I think is sufficiently ...