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.
在學校我把三年的數學課程一年就學完了，我特別擅長心算。
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.
就在價格上漲或下跌的時候，我可以確切地記得他們在前一天那個時候的浮動情況，我對心算的喜愛在我的工作中越來越方便。
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.
即使縂統候選人知道自己正滑曏偽善的深淵，但縂不能讓他們在整個競選活動中不停地做心算來維持本能。

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