She probably hadn’t learned the metric system, and now, after a summer of cramming and directives by the administration, she was being held accountable for teaching it to a bunch of wide-eyed ...

Slide 1 of 4, Part of a ruler from 0 to 6 centimetres and 60 millimetres, with a pencil above. , You would use millimetres (mm) and centimetres (cm) for small lengths. Like this pencil.