If, like me, you sometimes have difficulty in doing basic maths sums in your head, then head along to GeeksAreSexy (oh yes we are 🙂 ) and have a look at their simple “is a multiple of” rules. And after that, why not mosy on down and have a look at 10 Easy Arthimetic tricks on ListVerse. If only these tips were taught in schools then I wouldn’t be so reliant on a calculator or computer….
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