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Arithmetic Functions
Mathematica immediately allows you to do arithmetic not only with individual numbers, but also with arbitrary lists or arrays—as well as symbolic and algebraic forms. Mathematica uses the latest platform-optimized algorithms to work with exact and approximate numbers up to billions of digits, as well as polynomials with millions of terms.
Reference
Plus (+) — addition of numbers, lists, arrays, or symbolic expressions
Times (×) — multiplication, entered as a space, 
or 
(Esc*Esc)
Divide (/) — division, also entered as 
(EscdivEsc)
Power (^) — power, entered as a superscript using Ctrl+^
Sqrt — square root, entered as 
using Ctrl+@
Total — total of elements in a list
Mean — mean of a list
Accumulate — cumulative sums in a list
Differences — successive differences in a list
Ratios — successive ratios in a list
