tibia-client/modules/core_lib/math/math.lua

function math.round(num, idp)
    local mult = 10^(idp or 0)
    if num >= 0 then 
    	return math.floor(num * mult + 0.5) / mult
    else 
    	return math.ceil(num * mult - 0.5) / mult
    end
end