Reading Doing Math Arithmetic Basic arithmetic operations are easy to enter in Mathematica. You may use your choice of notation, and you may choose to enter symbols via the palettes or the keyboard.
Spaces are optional.
You can also use the symbol. Square last output. Mathematica does not set limits on the size of matrices, as Maple does. If you want to use double precision, you must explicitly say so. Algebra Mathematica is more than a calculator, of course.