This is quite a nice video on Clash of Clans and Math. Only got 70 views so far, but it is definitely a well prepared video.
Another video:
Farming in Clash of Clans has just gotten harder, due to nerf on Town Hall not granting shield, and very powerful defenses for TH10 and TH11. Watch these videos and you may gain some idea on a better way to farm.
Singapore Maths Tuition 