Recall That for Historical Reasons NTSC Uses a Frame Rate $29.97 \mathrm{fps}$

Essay

Recall that for historical reasons NTSC uses a frame rate of $29.97 \mathrm{fps}$ .
But usually we capture video at 30 (or sometimes just 15) fps. To make these values jibe, a "drop frame" format is used. Naturally, however, one does not like to physically drop actual frames, so instead a few time codes are dropped per several minutes: we skip one time code assigned to frames every so often.
Devise a scheme for doing this so that we end up dropping an integer number of time codes per an integer number of minutes.