Chika Ofili discovered that if you take the last digit of any whole number, multiply it by 5 and then add this to the remaining part of the number, you will get a new number. If this new number is divisible by 7, then the original number is divisible by 7.
This extraordinary achievement has earned him the TruLittle Hero Award.
The TruLittle Hero Award recognises, celebrates and reward outstanding achievements of remarkable children and young people under the age of 17 years all over the country.
Nomination is by the public, the winners are from various areas of skills and talents.