Some devices are able to be addressed using rotary dials. If so, the first (left) dial represents the __________ and the second (right) dial represents the __________.

Some devices are able to be addressed using rotary dials. If so, the first (left) dial represents the __________ and the second (right) dial represents the __________.

• A. Tens / Ones
• B. Hundreds / Tens
• C. Ones / Tens
• D. Thousands / Hundreds

Answer: (A)

When addressing two-digit numbers with rotary dials, the left dial carries the higher-order digit and the right dial carries the lower-order digit. So the left dial represents tens and the right dial represents ones. For example, left set to 2 and right set to 7 selects twenty-seven. This follows normal number notation, where tens come before ones. The other options would require more digits (hundreds or thousands) or would put a smaller place value on the left, which isn’t how two-digit input is arranged.

When addressing two-digit numbers with rotary dials, the left dial carries the higher-order digit and the right dial carries the lower-order digit. So the left dial represents tens and the right dial represents ones. For example, left set to 2 and right set to 7 selects twenty-seven. This follows normal number notation, where tens come before ones. The other options would require more digits (hundreds or thousands) or would put a smaller place value on the left, which isn’t how two-digit input is arranged.