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Octal numeral system
With the eight numerals 0, 1, 2, 3, 4, 5, 6, 7 we make the octal numbers.
Explanation
With 1 octal numeral you can make 81 = 8 numbers.
0 = 0 1 = 1 2 = 2 3 = 3 4 = 4 5 = 5 6 = 6 7 = 7
With 2 octal numerals you can make 82 = 64 numbers.
00 = 0 01 = 1 02 = 2 03 = 3 04 = 4 05 = 5 06 = 6 07 = 7 10 = 8 ⋮ ⋮ ⋮ ⋮ 75 = 62 76 = 63 77 = 64
With 3 octal numerals you can make 83 = 512 numbers.
000 = 0 001 = 1 002 = 2 003 = 3 004 = 4 005 = 5 006 = 6 007 = 7 010 = 8 ⋮ ⋮ ⋮ ⋮ 775 = 510 776 = 511 777 = 512
Example 1
On a Casio fx9860GII calculator you can select a numeral system.