Skip to main content


The secret of 73. Write this number on a piece of paper, fold it and give it to a friend. Ask himher to enter any four-digit number on a calculator and repeat it. Divide by 137. The answer will always be a whole number.

Then divide by the first four-digit number. The answer will always be 73.

Log in or register for FREE to continue reading.

It only takes a moment and you'll get access to more news, plus courses, jobs and teaching resources tailored to you