The number of 5' ends would be Gap 1:6, Gap 2:12.
The carbon atoms in the sugar ring are numbered from 1' to 5', and the "5 prime end" of a nucleic acid strand has a free hydroxyl (or phosphate) on a 5' carbon and the "3 prime ends" has a free hydroxyl (or phosphate) on a 3' carbon. For a single-stranded (ss) DNA strand or an RNA strand, that is an easy enough task.
The pairing of the 5' end of one strand with the 3' end of the other strand in double-stranded (ds) DNA is not immediately apparent, however (it is "antiparallel"; ). If one strand is the sense strand of a gene. In that situation, the direction is determined by the sense strand's orientation.
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