Digital Root
Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
High Quality Content by WIKIPEDIA articles! The digital root (also repeated digital sum) of a number is the number obtained by adding all the digits, then adding the digits of that number, and then continuing until a single-digit number is reached. For example, the digital root of 65,536 is 7, because 6 + 5 + 5 + 3 + 6 = 25 and 2 + 5 = 7. Digital roots can be calculated with congruences rather than by adding up all the digits, a procedure that can save time in the case of very large numbers. Digital roots can be used as a sort of checksum. For example, since the digital root of a sum is always equal to the digital root of the sum of the summands' digital roots. A person adding long columns of large numbers will often find it reassuring...
ISBN: 978-6-1311-2602-4
Издательство:
Книга по требованию
Дата выхода: июль 2011