Multiply by 11
To multiply anything by 11, just "split"; it in half and insert the checksum of the multiplicant in between :)
For the German readers: checksum = Quersumme
And more of this "math fun stuff"; from Stefan Graf's blog
To multiply anything by 11, just "split"; it in half and insert the checksum of the multiplicant in between :)
For the German readers: checksum = Quersumme
And more of this "math fun stuff"; from Stefan Graf's blog