Chickenpox (Chicken Pox) , also known as Varicella, is a very contagious infection caused by the varicella zoster virus. In several parts of the world it is just known as varicella. Patients develop a blister-like rash, which first appears on the face and trunk, and then spreads throughout the body.
Modular arithmetic. Time-keeping on a clock gives an example of modular arithmetic. Modular arithmetic, sometimes also called clock arithmetic, is a way of doing arithmetic with integers. Much like hours on a clock, which repeat every twelve hours, once the numbers reach a certain value, called the modulus, they go back to zero. People talked about modular arithmetic in many ancient cultures.
Modular arithmetic is the arithmetic of congruences, sometimes known informally as clock arithmetic.. In modular arithmetic, numbers wrap around upon reaching a given fixed quantity, which is known as the modulus (which would be 12 in the case of hours on a clock, or 60 in the case of minutes or seconds on a clock).xample calculations in arithmetic modulo 12 include statements like  , or  , or  , although the equal sign is commonly replaced with the congruence sign in such statements to indicate that modular arithmetic is being used. More explicitly still, a notation such as. is frequently used.