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In Algematics, the basic operations: +, -, × and ÷ are not like similar buttons on a calculator. They work on algebraic expressions and equations as well as numbers.

The operator buttons: combine two things: 

1. The selected number, expression or equation, and

2. the contents of the input box: 

Example 1: The input box contains the number 4, then clicking once does this:

(The answer can be calculated by clicking , which is similar to the '=' key on a calculator.)

Example 2: The input box contains the equation: 3p + 2q = 15, then clicking once does this:

Example 3: The input box contains the expression: x-5, then clicking once does this:

Example 4: The input box contains 2x, then clicking once does this:

Example 5: The input box contains the expression: 4r + 1, then clicking once does this:

Example 6: The input box contains the number 4, , then clicking once does this: