I have been doing dozens since Jan 1995 and learned in my 10th year as a dozenist (Oct 2016) that I'm not the only one in this world.
I keep a dozens count of days of important events in my life and I take the prime factors. I'm about B590 days old, most events in my life are more recent.
I know the prime factors of every number up to gross as well as I know my decimal times tables. There are about 4 that I sometimes have to figure out and there are about 3 or 4 that I don't know as quickly as 3 x 4.
I know about 2/3 of the prime factors between gross and 2 gross. And I recently tried to name all the primes up to 205z and missed one.
I'm talented in doing arithmetic in my head so numbers less than 1000 are usually simple to find prime factors.
I'm interested in the dozens skill of others here.
Do you have to use a dozens multiplication chart?
Can you count to gross without making a mistake?
How often do you use dozens in life?