Well it may be because round numbers are intrinsically motivating to us, even if there's no obvious reward for reaching them. That's according to a study in the journal Psychological Science.

根据发表在《心理科学》杂志上的研究，这可能是因为整数对我们来说有内在激励，即使实现他们并没有明显的回报。

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How do you round Numbers like 32 and 38 to the nearest ten?

你如何把32和38两个数字用四舍五入取到十位数呢？

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By investigating the inherent relations of round Numbers, we find that although the round Numbers may grow infinitely, the distance of round Numbers is bounded by a finite value.

本文通过分析轮数之间的相互关系，发现虽然算法的轮数可以无限增加，然而轮数之间的距离却是有界的。

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Speaking of behavior, I have to maintain a fertile learning environment in here. We've got round numbers in excess of 400 people sitting here, so I expect certain things here, and that's how we're going to get along.

说到行为，我要维护一个良好的学习环境,我们的人数有点多,400人坐在这，所以，我期待一些事情，那就是我们相处的方式。

麻省理工公开课 - 固态化学导论课程节选

Round numbers, this is one angstrom.

取整数是一埃。

麻省理工公开课 - 固态化学导论课程节选

So the problem I want to do-- there are many things you could do but I just picked one, and this is the one with round numbers, so I can do it without a calculator.

我想讲的这道题,类似的题目很多,但我就选了其中一个,这道题涉及的数字都是整数,所以我不需要计算器

耶鲁公开课 - 基础物理课程节选

The next most common is 5, which is a nice halfway point between round numbers.

FORBES: Your Home's Lucky Number

Ninety-nines on the end of prices seemed to help bottles sell faster than round numbers.

ECONOMIST: Face value

Forgive me the sin of using round numbers, but 3% is close enough for the sake of my argument.

FORBES: Why GDP Growth Matters