1. Press the "CE/C" button to clear any previous calculations from the calculator. 2. Use the number keys to type in the number of which you are trying to find the log,
http://www.ehow.com/how_8430125_uselogbuttoncal...

either a "x" or * button.
http://wiki.answers.com/Q/What_is_the_multiplicati...

These are memory functions. Old or simple calculators have a memory register  essentially a second calculator that can handle addition/subtraction only. M+, M: Add (or subtract)
http://www.quora.com/Calculators/WhatdotheMCM+...

NCr = 120 / 12 nCr = 10. It is used to instead of calculating the formula
http://www.chacha.com/question/whatisthencrbut...
