How should numbers be spoken during radiotelephone transmissions?

• A. Digits are spoken in pairs
• B. Digits are spoken individually
• C. Digits are transmitted using Morse code
• D. Digits are spoken together as a string without pauses

Answer: (B)

Numbers should be spoken one digit at a time during radiotelephone transmissions. Saying each numeral separately makes the sequence much easier to hear and interpret clearly over radio, especially with static, interference, or non-native listeners. For example, a frequency like 123.45 would be spoken as “one two three point four five,” with the decimal sign rendered as “point.” This digit-by-digit approach prevents digits that sound alike from creating confusion when heard in real conditions.

Speaking digits in pairs or as a continuous string would increase the chance of mishearing a sequence, and Morse code isn’t used for voice radiotelephony. By vocalizing each digit individually, pilots and controllers maintain precise, unambiguous communication.