This is Chika Ofili.
He is the Nigerian prodigy who created his own mathematical formula at age 12.
His formula was tested with a lot of examples and it proved right.
Chika Ofili was presented with a Special Recognition Award for making a new discovery in Mathematics.
His dicovery was a formula for divisibility by 7.
To use the formula, add the last digit of a number to the remaining and multiply it by 5.
Here’s a worked example.