carpentry isn't a closed domain. It is a wide range of skills. If you're in a country using inches and feet you would benefit from knowing the 12 times tables,

carpentry isn't a closed domain. It is a wide range of skills. If you're in a country using inches and feet you would benefit from knowing the 12 times tables, more than you need 8x or 7x actually you'll have practical benefits from 12x. having comfort in fractions of a fourths, eighths and 16ths is also nice for applying measurements. It's for everyone to put things to use in their life.