ENIGMA 1561 — Some check!by Bob WalkerChecksums have been used for years to check the accuracy of calculations. To calculate the checksum of a number you add up its digits. If that total is a single digit then that is the checksum; if not, the digits in the total are added to produce a new total, and the process is repeated until a single-digit answer is produced. That single digit is the original number’s checksum. What is the checksum of the number (2100 + 3200)300 ? |