Maths
BBC Bitesize
A variety of short videos explaining concepts to children:
http://www.bbc.co.uk/education/subjects/zjxhfg8
A variety of online games graded easy, medium and hard:
http://www.bbc.co.uk/bitesize/ks1/maths/
Top Marks
A well used website with an array of games that are tablet friendly, although some are PC only:
http://www.topmarks.co.uk/search.aspx?Subject=16&AgeGroup=2
Also on this website is a link to IXL, which has short activities to practise maths skills:
Games 4education
Links to a variety of interactive games suitable for your child:
http://games.e4education.co.uk/
ICTgames
A good range of place value, money, subtraction and adding activities: