Hi shebird:
I think (at least for me) sometimes the request for ideas for homework (to school or MN) represents an underlying worry that your child just isn't doing enough.
Our school has also virtually dropped homework. Partly because Gove has removed the requirement but also because the teachers as a group don't like giving it or marking it (although marking from the point of view of the pupil at our school is merely a tick; there are no comments. Not sure if something more substantive is prepared within the school for school management team, but we don't see anything but a tick).
We've found a number of things to help keep the ball rolling:
SPELLING/ GRAMMAR
St Ambrose Primary (Wigan) has a brilliant KS2 Spelling page: www.saintambrosebarlow.wigan.sch.uk/spellingpage.htm
You can explore the word lists, but what we really like is the on-line exercises dealing with spelling rules/ exceptions. It's organised by year.
CGP do a nice series National Curriculum English books by Year and then a review book for End KS2
LITERACY:
Woodlands Junior Literacy zone has all sorts of games to support grammar and writing ideas - resources.woodlands-junior.kent.sch.uk/literacy/index.htm
We also take the opportunity to have our DDs write postcards & letters (thank you letters are ideal, but also letters to competitions or tv shows).
MATHS
Again CGP do a nice series of books, with explanations as well as practice.
Schofield & Sims do work books with sheets of problems to solve (great for more able students seeking practice - not so great if you need to explain underlying concepts)
On-line tutorials: We've turned to mathsfactor (www.themathsfactor.com/) - we have the monthly subscription to the arithmetic school, but you can just download worksheets or join the winter (now closed) or summer (opens later this year) schools. We put in 1 hour to 1 1/2 hours a week, and it has meant that my DD1 has progressed well in maths (she seriously struggled in KS1 before we started doing things ourselves and is at a school ranked 'lowest' locally & nationally on OFSTED School Data Dashboard for maths). If you are at all worried about the quality of tuition and that there are gaps in understanding, I would heartily recommend this as a solution. Others here on Mumsnet have sung the praises of Maths Whizz (www.whizz.com/) and mathletics (www.mathletics.co.uk/).
free maths websites:
multiplication dot com: www.multiplication.com/
Woodlands Junior School Maths Zone: resources.woodlands-junior.kent.sch.uk/maths/
Cool maths for kids: www.coolmath4kids.com/
SCIENCE:
Again, Woodland Junior school has a great Science Zone too: resources.woodlands-junior.kent.sch.uk/revision/science/
Try to visit natural history museums, engineering related historical sites (mills, steam railways, etc...), watch documentaries, go to an IMAX cinema for nature films, look at the stars on clear nights, etc....
HISTORY
Well fortunately we're surrounded by all sorts of wonderful history here anyway - so there's lots to visit regarding British History (look up things on national trust or English Heritage websites).
Egypt: visit local museums, British Museum, Petrie Museum, etc...
BBC History for Kids website is fantastic: www.bbc.co.uk/history/forkids/
GENERAL HOMEWORK HELP
There is also a great webpage from Kent (Chiddingstone) called Primary Homework Help for Kids which has a lot of great links as well: chiddingstone.kent.sch.uk/homework/
Also BBC Learning (BETA - or in design) has all sorts of resources - enter through schools/ teacher and go directly to the KS2 section (in orange box on left) and select the subject area you're interested in - there are then links to games, worksheets, lesson ideas, etc... - www.bbc.co.uk/schools/teachers/
Primary Resources often has nice worksheets to help with more practice (especially if your DC is finding something particularly tricky): www.primaryresources.co.uk/
Activity village often has great resources related to reading - type in Harry Potter for example: www.activityvillage.co.uk/. They're very good on word searches and crosswords - but keep in mind this is a US site so spellings may vary.
Also don't be afraid to just google - especially when it's something specific (Roman army, electrical circuits, etc....) - there are all sorts of things out there and new stuff goes up everyday. Also make sure to check the video results for google as well.
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I use the curriculum outlines from Campaign for Real education: www.cre.org.uk/primary_contents.html as a guide to what is possible to be covered. This is serious gold standard stuff and your school may well not be working to it - but it is good to understand what should be covered (or can be) when.
The proposed national curriculum for primary (from 2014) is now out for consultation: info here: www.education.gov.uk/schools/teachingandlearning/curriculum/a00210036/sosletter - not all subject areas have a detailed curriculum, but a general outline of what should be covered is there. What I will add is that many have posted in horror at the history proposals, but in fact it is yet to be explained what applies to KS2 and what applies to KS3 - the list of topics is for both key stages.
There probably is more, but that's a start for you. HTH.