HVACR PE Exam: Time Saver Conversions or Constants to Memorize?

For those who have passed the HVACR PE exam, are there any crucial time saver conversions, constants, or relationships you recommend memorizing that are not clearly provided in the NCEES handbook?

I am putting together a short list of numbers that are faster to recall than search for.

Examples:

• 448.87 to convert GPM to ft³/s quickly
• Rankine = °F + 460 (technically in the handbook, but buried in the combustion section)

Are there others you found especially helpful on exam day? Things like quick heat transfer constants, pressure to head conversions, psychrometric shortcuts, etc.

Appreciate any insight from those who have taken it.