The runway ends marked with the numbers 9 and 27 indicate approximate magnetic headings of

• A. 090 degrees and 270 degrees magnetic
• B. 090 and 180 magnetic
• C. 080 and 260 magnetic
• D. 100 and 260 magnetic

Answer: (A)

Runway numbers show the magnetic heading of each end, rounded to the nearest 10 degrees, and the two ends differ by 180 degrees. So a runway end labeled with 9 corresponds to about 90 degrees magnetic, and the opposite end labeled with 27 corresponds to about 270 degrees magnetic. In other words, the approximate headings are 090 degrees and 270 degrees magnetic. The other options either don’t use the tens-of-degrees format or mix up the opposite-end heading, which would not match how runway numbers are assigned.