EASY METHOD TO CHECK DIVISIBILITY BY A NUMBER (sum of digits at odd places)-(sum of digits at even places) = either 0 or a number divisible by 11. 9. Divisibility by 12 : Must follow the rules for 3 and 4. 10. Divisibility by 15 : Must follow the rules for 3 and 5. 11. Divisibility by 7 : Negative Oscillator 2. Ex : 3654 365|4 x -8|-2 (multiply last digit by -2 & subtract with rest digit) ---------- 35|7 x -14|-2 (multiply last digit by -2 & subtract with rest digit) -------- 21 => this is divisible by 7, so we can stop the process now. 12. Divisibility by 13 : Positive Oscillator 4. Ex : 275 => 275|6 x +24|+4 (multiply last digit by +4 & add with rest digit) ---------- 29|9 x +36|+4 (multiply last digit by +4 & add with rest digit) -------- 65 => this is divisible by 13, so we can stop the process now.
Posted on: Mon, 21 Oct 2013 09:57:49 +0000
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