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This is a great time for kids to catch-up on Maths, Science, etc. that they may have fallen behind in, before School break. While others pay tutors or tutoring centres, your kids can revise COST-FREE (except any Internet fees for downloading them).
MIT-graduate Salman Khan has been making & publishing (for cost-free access & use) tutorial videos for years, not; he's put up over 2,400 (so far), on a range of topics.
(Check out what school & uni students are saying about them, eg, in the Education forum on http://forums.Whirlpool.net or just go to the Khan Academy site & check 'em out - FREE!)
There a collections of Khan Academy tutorial videos (by topic, eg, Algebra, etc.) that have Creative Commons licenses & almost no restrictions on how you can use them (ie, instead of strict commercial copyright with many restrictions, that other products have).
No strings.
I understand that Sal Khan has received grants from Googls and also the Bill Gates Foundation, to enable him to continue to make & publish more free-to-use tutorials.
Teachers & tutors / mentors may like to look into the exercise mechanism, that lets them keep an eye on their students' progress (ie, if students access this material & exercises online), and clear indications of when (& on what) a student has got stuck.
Great for home schoolers, but also in use (eg, in USA) in public & provate schools.
He takes a much more serious approach to learning than, say, the commercial Mathletics seems to do; you won't find silly cartoons or be distracted by a silly virtual shop or "dress your character" page, that school kids spent hours of their lives on in Mathletics.
It doesn't bother about NAPLAN (like Mathletics seems & claims to do); instead it just helps people learn real Maths, Science, & lots of other subjects, useful to serious students in or aiming for entry into uni or some TAFE programs.
Product idea: Mate a cheap, dual-core netbook with the 30+ GB of downloaded tutorial videos from Khan Academy, & sell the package to Public Libraries, Home Schoolers' (parents), etc.
This can even help supplement Distance Education learners' work sheets, etc.
Here, you can download just the subject(s) you want:
. http://www.Archive.org/details/KhanAcademy
They show you the Creative Commons license details (hardly any restrictions, other than to give Sal credit for his work, which is fair enough).