I'm sure it varies considerably, but is it (say) 'very unlikely', 'unlikely', 'possible' or 'quite possible' to get a Grade C without the ability to rapidly recall (say) 7, 8 and 9 times tables? I'd like to know because, I've many students in a bottom set Year 9 class who don't know their times tables, but are otherwise fairly bright. In (future) discussions with their parents, I'd like to put it in concrete (but reasonably accurate) terms just how limiting this lack of skill is likely to be. Some parents might be more motivated to 'encourage' home learning of times tables if they realized it was likely to jeopardize their child getting a Grade C? Or, conversely, perhaps I shouldn't worry about this set of students too much if they stand a reasonable chance of 'getting' a Grade C without such rapid recall. [I find it particularly hard to motivate Yr9+ students to learn and practice their times tables. As well as naturally not wanting to put in the effort, I believe they are also deterred by the fact that many times table learning resources and games have a very childish 'look', which they find aggressively condescending/humiliating. (e.g. on MangaHigh, it's building a column of ice cream cones)].