Ok this is extremely small, simple and easy to use script

All you do, is once inserted type !calc #$#
Replace the #s with numbers and the $ either / for divide, * for multiply, + for add or - for subtract

You can add more than 2 numbers and 1 action if you'd like and it's a very simple code

But I think calculator is a very good thing to have for a bot so here it is...

///Insert below in .mrc or .ini file\\\
///Start script\\\

on *:text:!calc*:#: {
  notice $Nick $calc( $2-)
}

///End script\\\