Computation is the process of using algorithms to solve problems and perform calculations. ESTIMATE, COUNTING, CIPHERING, ADDITION, ARITHMETIC, MATHEMATICS, ESTIMATION, MEASUREMENT, ADDING, RECKONING, and CALCULATION are all terms related to computation. ESTIMATE and ESTIMATION refer to making an educated guess based on available information. COUNTING is the process of determining the number of items in a set. CIPHERING is the process of encoding or decoding information. ADDITION and ADDING refer to the mathematical operation of combining two or more numbers to get a sum. ARITHMETIC is the branch of MATHEMATICS that deals with the manipulation of numbers. MATHEMATICS is the study of topics such as quantity, structure, space, and change. MEASUREMENT is the process of determining the size, amount, or degree of something. RECKONING is the process of calculating or estimating something. CALCULATION is the process of determining the numerical result of a problem.