Hi UnrequitedSkink
I think base cunning is usually worth a try.
Does he like gaming? Get him to do maths games whilst you cook. Maybe just 10 minutes or so at first - but it's practice.
MATHS:
good webistes: BBC Bitesize KS2: www.bbc.co.uk/bitesize/ks2/maths/
specific area help from BBC Learning KS2: www.bbc.co.uk/schools/teachers/keystage_2/topics/maths_ks2.shtml - links to games/ worksheets
Woodland Junior School Mathszone: resources.woodlands-junior.kent.sch.uk/maths/ - again task specific practice work by video games mainly.
Cool Maths: www.coolmath-games.com/
Maths champs (select games for 9 - 11): www.mathschamps.co.uk/#home
If he likes a challenge try NRICH Maths (a series of problems to solve which are pretty challenging designed by Cambridge University): nrich.maths.org/secondary-upper
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READING:
Can't watch the movie until you've read the book. DH thought of this - but it's been great. Good news with the Hobbit is it's one book in 3 films so can read in thirds, usually by half-way they want to finish anyway.
Great for Harry Potter, Holes, Lord of the Rings, Railway Children, Chitty Chitty Bang Bang, Wizard of Oz, Alice in Wonderland, Peter Pan, etc...
Autobiography/ Biography: Does he idolize someone? Check out an autobiography on that person or Biography.
History: Does he really like a particular period of history? Fiction related to period or factual book related to that period.
Magazines and comics count too!
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Writing
Don't fill in the forms for him, make him do it.
Don't e-mail off for competitions - have him write an old fashioned letter.
Thank you letters (old fashioned yes, but grandmas and grandpas, aunties and uncles absolutely love them).
comics: Don't underestimate the power of the comic strip. There are on-line comic strip makers (e.g.: www.bitstrips.com/create/comic/) which gets him thinking of plots and stories lines & writing. Some schools have signed up to this kind of thing already - so ask him if that's the case at his school.
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Science
Don't underestimate the power of good TV: Many of the documentaries are great for this and very pleasant viewing. Evil DH plan #2 is we can only eat in front of TV if we watch a documentary.
For example the migration of the monarch butterfly will be on BBC Four on Saturday (9 - 10 p.m. - late so record it).
But there's tons of documentaries on all sorts of things geography, history, biology, astronomy. Springwatch and Autumnwatch can be fun and Stargazing life/ Stars at Night are also brilliant.
BBC websites are great for this kind of thing and often have resources.
Also brilliant for history, geography, religion (i.e. recent wonderful programme by Dan Snow on Syria combining all of this & bringing us bang up to date with the troubles there: www.bbc.co.uk/programmes/b01rb2st - 6 days left on iplayer so not long left.
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They have now dropped homework requirements in primary schools in England, but basically if your DS can put in 30 minutes a day (reading, writing (competitions, thank you letters, etc...) and on maths games - he'll gradually develop that habit of doing a bit after school, which will be good for senior school when that will be required and essential for progress.