/usr/share/perl5/Math/ is in libmath-calc-units-perl 1.07-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Math/Calc/
/usr/share/perl5/Math/Calc/Units/
/usr/share/perl5/Math/Calc/Units.pm
/usr/share/perl5/Math/Calc/Units/Compute.pm
/usr/share/perl5/Math/Calc/Units/Convert/
/usr/share/perl5/Math/Calc/Units/Convert.pm
/usr/share/perl5/Math/Calc/Units/Convert/Base.pm
/usr/share/perl5/Math/Calc/Units/Convert/Base2Metric.pm
/usr/share/perl5/Math/Calc/Units/Convert/Byte.pm
/usr/share/perl5/Math/Calc/Units/Convert/Combo.pm
/usr/share/perl5/Math/Calc/Units/Convert/Date.pm
/usr/share/perl5/Math/Calc/Units/Convert/Distance.pm
/usr/share/perl5/Math/Calc/Units/Convert/Metric.pm
/usr/share/perl5/Math/Calc/Units/Convert/Multi.pm
/usr/share/perl5/Math/Calc/Units/Convert/Time.pm
/usr/share/perl5/Math/Calc/Units/Grammar.pm
/usr/share/perl5/Math/Calc/Units/Grammar.y
/usr/share/perl5/Math/Calc/Units/Rank.pm