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Rishonly Posted 20 years ago
Jokes, Puzzles & Riddles

I can read your mind through Internet

01. Imagine a number that is greater than 1 , and keep it in your mind.02br
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002.Multiply that number by 9 and keep the result in your mind.02br
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003.Now, sum the digits of your result.02br
02br
00OK. Let me read your mind..........Yes, the answer in your mind is "9". Sounds crazy? 050010id1
  

Top answer

1b 01font 00this is simple02font 02b 02br 02br 01b 01font 00for any number to be divided by 9 ,the sum of its digits must be 9 or something divided by 9 too02font 02b 02br 02br 01b 01font 00try to multiply any number by 9 and then add the digits of the result all together 05002font 02b 02br 02br 01b 01font 00same rule applied for 3. any number to be divided by 3 the sum of its digits must be 3,6,9, or anything dividable by 302font 02b 02br 02br 01b 01font 00good one here02font 02b 02br 02br 00[Y]010id2

— Tattyjacky

  • 1b 01font 00this is simple02font 02b 02br 02br 01b 01font 00for any number to be divided by 9 ,the sum of its digits must be 9 or something divided by 9 too02font 02b 02br 02br 01b 01font 00try to multiply any number by 9 and then add the digits of the result all together 05002font 02b 02br 02br 01b 01font 00same rule applied for 3.
  • any number to be divided by 3 the sum of its digits must be 3,6,9, or anything dividable by 302font 02b 02br 02br 01b 01font 00good one here02font 02b 02br 02br 00[Y]010id2
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14 Answers
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1b01font00this is simple02font02b02br
02br
01b01font00for any number to be divided by 9 ,the sum of its digits must be 9 or something divided by 9 too02font02b02br
02br
01b01font00try to multiply any number by 9 and then
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0 01blockquote
01cite10Tattyjacky12cite11b11font10this is simple12font12b12br
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11b11font10for any number to be divided by 9 ,the sum of its digits must be 9 or something divided by 9 too12font12b12br
12br
11
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0 congratulations:) 0-
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0 01blockquote
01cite10Rishonly12cite10Perfect. You got the key, Tatty.12blockquote
10In fact, Tattyjacky and Rishonly, that's the quick trick we use to test a number's divisibility by 9. 05000 Used it since I was eight years old, in fact05102br
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00Cheers!02br
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00 - Joy02b
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0 01blockquote
01cite10Tearsofjoy12cite11blockquote
11cite20Rishonly22cite20Perfect. You got the key, Tatty.22blockquote
20In fact, Tattyjacky and Rishonly, that's the quick trick we use to test a number's divisibility by 9. 15010 Used it since I was eight years old, in fact15112b
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0Nope, Rishonly, it was taught to us in school! 05002br
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00Here are the divisibility keys that I know - 02br
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002 - last digit is an even number02br
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003 - sum of the digits is a multiple of 3. If that number is too long, then sum the digits again and again till you get to a 2-digit or 1-digit number.02br
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0Courtesy of 01a05000 02a00, we have - 02br
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00Divisibility test for 11 - The difference between the sum of the odd numbered digits (1st, 3rd, 5th...) and the sum of the even numbered digits (2nd, 4th...) is divisible by 11. 02br
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00There's a test for 7 in there too, but I foun
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1font001. think of a number?02font02br
02br
01font002. double the number?02font02br
02br
01font003. add 100?02font02br
02br
01font004. half the number?02font02br
02br
01fo
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1font001. think of a number? 02font00X02br
02br
01font002. double the number? 02font002X02br
02br
01font003. add 100? 02font002X + 10002br
02br
01font004. half the number? 02font
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0> number 9.02br
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00Of course, you need to mention that this trick will not work02br
00when the last digit is 1 (11, 21, 31, etc.)0-
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