If you asked DS aged 7 what 3×8 equals ( for example) he might falter and take a while to answer so you might get the impression he doesn't know his tables well. Yet when he recites his tables up 6, he gets them right. We're working on the 7, 8, and 9 tables. I would like him to be able to recall multiplication facts quicker- we are practising.
Is he just getting nervous?