NUMERALS IN NONDECIMAL BASES

A nondecimal numeration system may use letters to supplement the 10 Arabic numerals and to represent the additional digits required. In such instances, uncapitalized letters must be used in braille. If capitalized letters are used in print, a transcriber's note must be included to explain the change to uncapitalized letters.
The letters used to represent digits in a nondecimal numeration system must be treated as numerals, and the numeric indicator must be used where required. Such numerals are mathematical symbols and must be punctuated accordingly.
1. 13T8 and T1E5 are base 12 numerals, T represents 10 and E represents 11.
2. In base 12, can -t2e be a negative number?
3. The digit "T" denotes "ten."
4. Add in base 12: 24T, 3E, 5E.
5. The letters T and E represent ten and eleven in TE5.
A nondecimal numeration system may use special signs, such as and , in conjunction with the 10 Arabic digits; or it may use an arbitrary set of signs, such as $ ¢ %, which contains no Arabic digits. In such cases, one-cell symbols preferably chosen from the letters of the English alphabet must be selected to represent these special signs. A transcriber's note must be inserted to specify the meanings assigned to these symbols, and must also include a drawing of any print sign lacking an equivalent symbol in the code.
The symbol for these special signs in nondecimal numeration systems must be treated as numerals, and the numeric indicator must be used where required. Such signs are mathematical symbols and must be punctuated accordingly.
2. $¢% is a base 3 numeral.

Developed by

The Shodor Education Foundation, Inc.
in cooperation with the
North Carolina Central University
and the Governor Morehead School for the Blind