Is 100mm or 1dm GREATER LESS THAN OR EQUAL?
\(100\ mm=10\ cm\ \ \ and\ \ \ 1\ dm=10\ cm\ \ \ \Rightarrow\ \ \ 100\ mm=1\ dm\)
100mm = 10cm (mm = 1/10 x cm)1dm = 10cm (cm = 1/10 x dm)100mm = 1dm