https://www.nnchallenge.org.uk/
National Numeracy Parent Toolkit has a wealth of tips and advice for parents.
http://www.nnparenttoolkit.org.uk/
Oxford owl includes a range of activities, top tips and eBooks to help your child with their maths at home.
http://www.oxfordowl.co.uk/maths-owl/maths
Maths 4 Mums and Dads explains some of the milestones children make between the ages of 3 and 11 years old.
http://www.maths4mumsanddads.co.uk/
Nrich, a range of maths games, problems and articles on all areas of mathematics.
http://nrich.maths.org/frontpage
Ideas to see mathematics in everyday life