While not necessary in general usage, proper usage of zeros is essential in chemistry and physics where [[significant figures]] apply. A dash over the final digit (or digits) indicates that digit repeats infinitely, or without ending. Such cases are referred to as repeating decimals. | While not necessary in general usage, proper usage of zeros is essential in chemistry and physics where [[significant figures]] apply. A dash over the final digit (or digits) indicates that digit repeats infinitely, or without ending. Such cases are referred to as repeating decimals. |