I have always counted groups of things in threes, cards most commonly. The patterning takes more practice to get used to because the last digit doesn't repeat t

I have always counted groups of things in threes, cards most commonly. The patterning takes more practice to get used to because the last digit doesn't repeat the way it does when you count by twos. I also count coins by 5s if I have a bunch of them flat on a table - it's faster that way.