National Curriculum in England numeracy and mathematics guidance – this statement sets out the duties for teachers working with pupils between key stage 1 and key stage 4.
Nrich – a site comprising rich activity ideas, interactive resources, student/children’s solutions and an excellent range of mathematical education articles for practitioners.
NCETM – National Centre for Excellence in the Teaching and Learning of Mathematics. A rich source of additional policy guidance to complement the National Curriculum for mathematics. Also a source of CPD materials including videos.