00:00The Magical Trick of 7, 11, and 13
00:03The 7, 11, and 13 trick that feels like magic.
00:08Your calculator won't believe this math hack.
00:12Pick any three-digit number.
00:14Write it twice.
00:16Now divide by 7, then 11, then 13.
00:20Boom!
00:21The original number appears.
00:26Example.
00:273, 7, 1.
00:28Write it twice.
00:303, 7, 1, 3, 7, 1.
00:333, 7, 1, 3, 7, 1.
00:35Divided 7.
00:36Equals 5.
00:373, 0, 5.
00:393.
00:3953053.
00:41Divided 11.
00:42Equals 4823.
00:444823.
00:46Divided 13.
00:48Equal 371.
00:49Which is original number.
00:52Why it works.
00:54Secret.
00:557 times 11 times 13.
00:57Equals 1001.
00:58Writing a three-digit number is the same as 123 times 1001.
01:05Dividing by 1001 reverses the trick.
01:08Try it.
01:09Comment your number below.
01:11Want more mind-blowing math?
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