Math, for real

Multiplying and dividing decimals

https://www.youtube.com/watch?v=YKqd9JOG6DQ&feature=youtu.be
https://www.youtube.com/watch?v=_9RUZ1FlnZY&feature=youtu.be
https://www.youtube.com/watch?v=VkNTRoNd3Uk&feature=youtu.be