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Trick to Multiply by
N
-1 in Base
N
In base 10, multiplying digits by 9 produces a nice pattern. This Demonstration extends the trick, showing a simple way to multiply by
in base
.
Contributed by:
Izidor Hafner
SNAPSHOTS
DETAILS
Reference
[1] B. A. Kordemsky,
The Moscow Puzzles
, London: Penguin, 1990, p. 91.
RELATED LINKS
Multiplication Table
(
Wolfram
MathWorld
)
Multiplication Table
(
Wolfram Demonstrations Project
)
PERMANENT CITATION
Izidor Hafner
"
Trick to Multiply by
N
-1 in Base
N
"
http://demonstrations.wolfram.com/TrickToMultiplyByN1InBaseN/
Wolfram Demonstrations Project
Published: December 2, 2012
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