Good point, in fact, just simple stuff by 2 people each naming a high 2 figure no. & seeing who can do it in their head fastest is a good way to uncover who can read & remember and who can think on their feet. Tim Vine and his family do 3x3's for fun after Xmas lunch, if you didn't know so here...
Indeed, for many a Maths oral would reflect what we are faced with in life ie standing by the counter ordering tiles sized 15ch by 9cm for a floor 4.23m by 4.75m @ £11.99 and being able to tell the assistant he is hundreds out after he taps away for minutes