Playing it in my head. Did I do enough, or did I not do enough?

VOA: special.2009.12.11

I write 1.0 times 1.6. Even that I can do in my head.

写下1。0*1。6，即使我可以在头脑中想象。

麻省理工公开课 - 固态化学导论课程节选

Well, what I always do in anything like this is, the first thing I do is, I run it on something where I can actually compute the answer in my head. So I get a sense of whether or not I'm doing the right thing.

好的，我常常在,这种问题中会做的是，我会做的第一件事是我,会先带入我可以心算的值来运行,因此我能够知道我是否做对了。

麻省理工公开课 - 计算机科学及编程导论课程节选