Manipulate Memory Number

The usage of the memory buttons are:

MC: Clear the memory number.

MS: Store result number(if there is one) into memory.

MR: Read memory number into expression. If you have made a selection in expression, the selection is replaced by the memory number, otherwise, it inserts the memory number at current position in expression.

M+: Add result number(if there is one) with memory number and save the result into memory.