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One way of doing it, is to break it down into simple steps.
25 June 2011
So 26x19 is close enough to 26x20. So with some multiplication, addition and subtraction, we can work it out.
25 June 2011
So 26 x 10 = 260 plus another 260 = 520. But this is 26 too much. So 520 - 26 = 494.
25 June 2011
or you could do the chinese box method
its easy and shows working out
you can also use it for hundreds thousands and decimals numbers
26 June 2011
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