irvine, I am a primary teacher - not teaching Y3 at the moment, but have done - and use nrich regularly, as do my colleagues.
There is, btw, a specific, hopefully short term issue in primary at the moment, most specifically in Maths, due to the change in the primary curriculum in 2014.
The curriculum was not well consulted on, not trialled in schools, and there was no training around it (there was lots of training, trialling etc for the previous 'Rose' proposal for the new NC, but it was summarily scrapped by the new government when Labour left power). The tests - unfortunately very high stakes for schools - used to test it have not yet been run for the first time, and there are lots of uncertainties about what they will be like which are only slowly being resolved. Assessment between the 'key end of KS' tests is left up to schools to decide on, and there are a multiplicity of different approaches, some less accommodating of high ability than others!
The Maths curriculum in particular has taken three 'pretty good general principles' and hardened them into 'legal curriculum'
- We should not be satisfied that the 'least able' fall further and further behind, and wherever possible they should be accessing the same curriculum as their age peers.
- The curriculum as a whole should be more ambitious
- Extension should include 'broadening and deepening' rather than always being 'acceleration into the content of future years'
It also introduces the concept of 'mastery', which tbh has many definitions, all of which are slightly different. IMO, and it is only an opinion, there is also an interesting and slippery dichotomy within the curriculum between 'old fashioned learning-and-calculating-by-rote' and the idea of applying even quite simple maths to sophisticated and deep problems.
Schools are still, to an extent, grappling with these as well as all the other changes. Those in upper primary at the moment have been doing quite a lot of 'filling the gaps between the old and new curricula' (so, for example, the current Y3 were taught the old Y2 curriculum last year for their Y2 SATs. Y3 teachers are currently teaching not only the new Y3 curriculum but also the bits in the new Y2 curriculum that were not in the old one IYSWIM?)
Provision for the more able is also in some flux. Those schools that only extended through acceleration are having to re-think, while those who always did broadening and deepening are in a better position BUT that is less 'visible' in terms of 'objectives' to a parent.
mathshubs.org.uk/what-maths-hubs-are-doing/national-curriculum-assessment-materials/ are quite interesting, as the linked materials do try to exemplify what the difference between 'being able to do column addition' and 'mastering / understanding the concept of what addition is in depth'. They are, however, just one view - one of the challenges of teaching in primary at the moment is the state of flux, which as I say I hope will be short term, as a 'generally accepted norm' will emerge from the current 'every school for itself' scenario.