👉 Reduction math, also known as modular arithmetic, is a system of arithmetic for integers where numbers "wrap around" after reaching a certain value—the modulus. In essence, it deals with remainders after division. For example, in modulo 12, 13 is equivalent to 1 because 13 divided by 12 leaves a remainder of 1. This means that when you perform operations like addition, subtraction, multiplication, and division in modulo 12, the result is always taken modulo 12, ensuring that all results stay within the range of 0 to 11. This concept is fundamental in number theory and has applications in cryptography, computer science, and various other fields where cyclic patterns are important.