Two videos about measuring units & conversion between them
These two videos are the first ones I've uploaded to Youtube about measuring units. They're intended for about 4th grade -- when students start doing some simple conversions between the units, and they are already familiar with the units themselves and with the idea of measuring.
They also feature my mammoth mascot, Mathy, which I hope will be a fun element for any children who might watch these. There will be more in the coming weeks!