The Mind Creative March 2014
One needs to make a few presumptions before using the
Trachtenberg speed system:
●The answer must be found one digit at a time starting at the least
significant digit and moving left. The last calculation is on the
leading zero of the multiplicand.
●Each digit has a neighbour, i.e., the digit on its right. The
rightmost digit's neighbour is the trailing zero.
●The halve operation has a particular meaning to the Trachtenberg
system. It is intended to mean "half the digit, rounded down. For
example, half of seven is to be taken as three
●The tables for subtracting digits from 10 or 9 are to be memorized.
Rule: Add the digit to its neighbour (here neighbour is the
digit to the right)
Example: What is 3425 x 11?
Consider the number as 03425 and apply the rule (get each digit
of the result by adding each digit to its neighbouring digit on the
right
Hence, the digits of the answer would be:
(0 + 3) (3 + 4) (4 + 2) (2 + 5) (5 + 0) which is 37675
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