To find out if a number is divisible by seven:
Take the last digit, double it, and subtract it from the rest of the
number.
If the answer is more than a 2 digit number perform the above
again.
If the result is 0 or is divisible by 7 the original number is also
divisible by 7. [...]
In this first issue I’d like to tell u guyz about Vedic mathematics, a fast expanding field of mathematics. In this first episode, I’ll teach u how to make multiplication simpler. Let’s take 2 numbers (preferably 3 digits, it’ll make a good example) and multiply them using the Vedic methods. Here’s [...]
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