documentclass{article}
usepackage{ams math}
usepackage{multicol}
RequirePackage{enumitem}

begin{document}
noindent{bf Compare each pair. Use $>, <,  or = $ to make each statement true.}

begin{multicols}{2}
begin{problems}
item $0       -5$
item $2       7$
item $6        |6| $
item $-19       -10$
item $-5       -7$
item $18         |-18| $
item $|-12|        |12| $
item $-23       -25$
end{problems}
end{multicols}
end{document}

documentclass{article}
usepackage{amsmath}
usepackage{multicol}
RequirePackage{enumitem}

begin{document}
noindent{textbf Compare each pair. Use $>, <,  or = $ to make each statement true.}

begin{multicols}{2}
%begin{problems}
begin{itemize}
item $0 hfil -5$
item $2 hfil 7$
item $6 hfil |6| $
item $-19 hfil -10$
item $-5 hfil -7$
item $18 hfil |-18| $
item $|-12| hfil |12| $
item $-23 hfil -25$
end{itemize}
%end{problems}
end{multicols}
end{document}