Each unit, these links and games will change, so check back!
Unit 1:
https://www.ixl.com

http://www.teachingtime.co.uk/draggames/sthec2.html

http://www.bbc.co.uk/schools/numbertime/games/index.shtml

http://www.teachingtables.co.uk/paint/paint100.html

http://www.funbrain.com/cracker/index.html

http://www.primarygames.com/patterns/question1.htm

http://www.funbrain.com/ofm/index.html

https://www.mathsisfun.com/measure/thermometer.html