The White Rose website provides a short maths lesson and activity daily. There is a daily activity for each year group.
https://www.bbc.co.uk/teach/supermovers is a great for website for learning maths in a fun and active way. The children can join in with maths learning whilst getting some exercise.
http://www.iseemaths.com/home-lessons/ are maths lesson and activities for children in KS2