Before you start the Units and Conversion, please check -
https://www.youtube.com/watch?v=ZWZ5n5slX8I - make sure you can multiply and divide numbers by powers of 10
https://www.mathgames.com/skill/6.46-multiply-and-divide-decimals-by-powers-of-ten -- questions to check
http://www.math-play.com/Multiplying-Decimals-Basketball-Game/Multiplying-Decimals-Basketball-Game_html5.html -- questions to check
https://docs.google.com/presentation/d/1Ph8QU6rpNTgqNLu3zh3WckZ2SyoYreqZMjuhEchaPIA/edit#slide=id.g406cb554e6_0_6 (HVT Slideshow)