MATHEMATICAL DISCOVERY CAN BE MADE IN SCHOOL!

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Chika Ofili, a Nigerian boy, 12-year-old living in London just discovered a new Formula for divisibility by 7 in maths. 


Multiply the last digit by 5 and add it to the remaining numbers. 

 For Example 532

 53+2 * 5 =63 which is a multiple of 7, So 532 is divisible by 7.

 Chika Ofili has been presented with a special Recognition Award for making a new discovery in mathematics

 Here is a simple Proof:-

 If x+5b=0 mod 7 then multiplying by 10 we get

 10x+50b=0 mod 7. 

 But 50 is just 1 mod 7 so we get 10x+b=0 mod 7 as an equivalent statement.  

Comments

  1. BTMJune 9, 2020 at 7:21 AM

    Wondering why this never clicked to me during my school days... This was fascinating

    ReplyDelete
  2. UnknownJune 9, 2020 at 8:46 AM

    An interesting approach indeed. Such news should be given more recognition to tell high school students that they too, are not far from discovering something new !!

    ReplyDelete

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