Mathematical Discovery Can be Made in School

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 x 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.

A Proof for his Discovery:

• 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.