👉 Digit math is a branch of mathematics that focuses on the properties and operations involving digits, particularly in the context of numbers and their representations. It explores concepts like digit sums (the sum of digits in a number), digit differences, and digit patterns, often revealing interesting properties and symmetries. For example, the sum of the digits of a number is congruent to the number itself modulo 9, meaning the result of adding up all the digits gives a remainder when divided by 9 that's the same as the original number. This principle is foundational in various digit-based puzzles and has practical applications in cryptography, coding theory, and even in understanding the structure of numbers themselves.
