mental arithmetic

常见例句

I was quick at figures.At school I did three years of arithmetic in one. I was particularly good at mental arithmetic.
在学校我把三年的数学课程一年就学完了，我特别擅长心算。
I could remember in detail how the prices had acted on the previous day, just before they went up or down. My fondness for mental arithmetic came in very handy.
就在价格上涨或下跌的时候，我可以确切地记得他们在前一天那个时候的浮动情况，我对心算的喜爱在我的工作中越来越方便。
Even if the presidential candidates know in their guts that they are being hypocritical, they cannot very well be kept busy the whole campaign doing mental arithmetic.
即使总统候选人知道自己正滑向伪善的深渊，但总不能让他们在整个竞选活动中不停地做心算来维持本能。

His use of this extra memory space meant that he could circumvent that perennial pitfall of mental arithmetic, losing one's place.
ECONOMIST: Who wants to be a genius?
Wily suspects may try to raise their baseline readings artificially (by doing mental arithmetic, for example), making later fibs more difficult to detect.
ECONOMIST: Polygraphs hit the big time
Calculations by scientists, who are forever totting up times but are often bad at mental arithmetic, will also be much easier if they can just move decimal points instead of multiplying and dividing.
ECONOMIST: A 24-hour day is inefficient