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).

A usable fraction is a fraction you can use to measure with (i.e., 1/2, 1/4, 1/8, 1/16 inch). You measure with fractions of an inch. However, your calculator works in decimals of an inch. If you want ...

You can do fractions on your iPhone calculator using two different methods. When you turn your iPhone calculator sideways — switching it to a scientific-calculator layout — you'll be able to use more ...