Talk:de cabeça

Would "in one's head" be a good translation here? As in
 * A) Wow, you know the square root of 3000 - did you use a calculator?
 * B) No, I did the math in my head
 * The sense given here seems exceptionally complex - there's got to be a simpler equivalent in English --Rising Sun talk? contributions 16:16, 14 March 2010 (UTC)
 * That sense was complex indeed. I've moved it to the usage notes and added your suggestion. Thanks. --Daniel. 06:03, 31 March 2010 (UTC)