@alexhaist Now earwormed by the Divine Comedy, "She said there's something in the wood shed."

@futurebird thanks to the early 80s obsession with times able memorisation, that's locked in as an instant response.

But I also have a couple of maths degrees, so can 'play' with the numbers in my head, using other facts and 'checking' my own memory.

Like 7*7 is 49, + 7 and yup, 56.

Or as others have commented, (7*2)*4 or (7*4)*2 also help.

Or 60 = 15 * 4, and 15 is 14+1 = 7*2+1, so 60-4 works too.

I basically never assume my memory is correct, I always error correct/sense check!