I'm now a 19 years old undergraduate physics student. I've a reasonable proficiency with calculus (well, no really...) but if you ask me 6*7 (unlike my mother and many other older people I know) I'll take awhile until I come up with an answer (I'll ask myself 6*5 and then add 12 to that result). I've never recognized the value of multiplication table memorization. Instead, I have a very poor "multiplication database" on my brain and so I've to do some tricks to get to the results out of my database (like the exemple above). This can take awhile sometimes (most of the times actualy). Other people, intead, have a specific location for 6*7 on their brains and, therefore, they are faster on this. What do you think of this? To which group do you belong? Do you value the hability to do mental math (multiplication and sum)?