WOLFRAM NOTEBOOK

WOLFRAM|DEMONSTRATIONS PROJECT

Trick to Multiply by N-1 in Base N

​
base N
6
7
8
9
10
(N - 1) ×
1
2
3
4
5
6
7
8
9
9 × 5 = 45 in base 10
In base 10, multiplying digits by 9 produces a nice pattern. This Demonstration extends the trick, showing a simple way to multiply by
N-1
in base
N
.
Wolfram Cloud

You are using a browser not supported by the Wolfram Cloud

Supported browsers include recent versions of Chrome, Edge, Firefox and Safari.


I understand and wish to continue anyway »

You are using a browser not supported by the Wolfram Cloud. Supported browsers include recent versions of Chrome, Edge, Firefox and Safari.