Coolmath Games - Come for the games... Stay for the lessons.
http://www.coolmath.com/prealgebra/02-decimals/index.html decimals -add subt mult div
Generates unlimited amounts of division problems. Good for if you're making your own worksheet or activity!
Free Printable Nets to make 3D shapes. Perfect hands on tool for geometry. More free #CoolMath ideas here: https://www.teacherspayteachers.com/Store/Mathfilefoldergames/Price-Range/Free
Fractions by Zeebo! Online fraction lessons
Sharping your mind with this Free maths Games on www.coolmath-games.com - Globergist
Cool Math 4 Kids--Brainbenders
Coolmath Games for Kids: Math Lines 10 - this site doesn't appear to have ads on the side - better for kiddos
Site full of math activities