Spreadsheet Function: ABS()
Synopsis:

@ABS(expression)

Description:

This  function  returns  the  ABSolute  value of the
expression.   ie.  The sign of the number is ignored
so that all numbers become positive.

Examples:

@VAT(-123.4) would give, 123.4.
@VAT(10+1) would give, 11.
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Using Functions
Usefunc.help
Maths Operators
operators.help