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You can use the bc program as an online calculator. (bc is actually a programming language, similar to C, which is used for performing mathematical calculations.) To use bc, type bc and press <Enter> -- this brings you into bc. You can now type any arithmetic expression, press <Enter>, and bc evaluates it for you. When you are done using bc, press <Ctrl>D to return to the prompt.
For example, to use bc to add up your work hours, you could type:
$bc 7+6.5+8+8.5+7 37.0<Ctrl>D