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汉语拼音：xīn suàn

只凭脑子而不用纸、笔、算盘、计算器等进行运算。

1. 谓筹划，筹算。

   《晋书·律历志下》：“虽復使 研桑 心算， 隶首 运筹……皆未能并臣如此之妙也。” 晋 潘岳 《杨荆州诔》：“多才丰艺，彊记洽闻，目睇毫末，心算无垠。”《南史·施文庆传》：“ 文庆 聪敏强记，明闲吏职，心算口占，应时条理，由是大被亲幸。”

2. 口算。即只凭脑子而不用纸笔、算盘、计算机等进行运算。

• A bond dealer need not appreciate Proust, but he must be able to do sums in his head.

  一个债券经销商不需要感激蒲鲁斯特，但是他必须能够心算。

• He said if he can't do them in his head, I'm cheating.

  他说既然他都不能心算我肯定是在作弊

• But to make my job more interesting for you, as well as for me, I'm going to do this problem thinking out loud.

  为了给大家和我自己增加点乐趣，我会把心算过程大声的念出来。

• Any system of counting or calculation, whether mentally of by means of device, involves following a set of steps or directions.

  任何一种计算系统，无论是心算还是借助于设备，都包括下述的一套步骤方法。

• OK, what I'm going to try and do, is to square in my head a five-digit number requiring a 10-digit calculator.

  很好，我接下来要做的是，心算平方一个5位数的数字，这需要个10位数的计算器。

• It is not significant when mental arithmetic problems are simple, but it becomes more significant with the difficulty growing.

  数学焦虑对简单心算问题的影响不大，随着问题难度的增加，数学焦虑效应逐渐明显。

• For him, doing mental calculations was a form of play.

  对于他来说，做心算就如游戏一样有趣。

• But Carroll was the first person to devise an algorithm suitable for mental calculation.

  但是卡罗尔的算法确实第一个适合心算的。

• He mentally computed the square root of a hundred-digit number in fifty-two minutes.

  他在52分钟内心算出了一个100位数的平方根。