For an alternative perspective, see the Proportional Chart Maker
Double digit numbers show us what the single digit is based on.
For example, when it says 23/5, it means you have a 5 based on 23 (2+3). If it says 14/5, the 5 is based on 14 (1+4). However, the single digit is often calculated without being based on a double digit number. In that case you will only see one number listed.
Numerologists always consider the individual numbers of a double-digit number, because varying number combinations add different meanings to the single digit sum.