The National Numeracy site has a great ’essentials of numeracy’ diagram which encapsulates the essential components in understanding numbers, the number system and the ways that numbers can be combined and used – to help learners decide on their own personal starting point and pathway to develop key skills in numeracy.
A fabulous DfE funded site aimed at enhancing professional development in Maths teachers across all sectors and levels. There are news items, message boards, regular email magazines, stacks of resources and links to some very interesting blogs from maths teachers, etc.