整せい数すう

せ

い

す

う

Common wordJLPTN2Freq.FrequencyTop 50,000

Meanings

integer

Mathematical term for whole numbers, including negative numbers and zero.

〈数かず〉は整せい数すうであるX is an integer
この計けい算さんの答こたえは整せい数すうである。
The answer to this calculation is an integer.
〈数かず〉を整せい数すうに四し捨しゃ五ご入にゅうするto round a number to the nearest integer
3.7を整せい数すうに四し捨しゃ五ご入にゅうすると4になる。
Rounding 3.7 to the nearest integer gives 4.
整せい数すうで割わり切きれるto be evenly divisible by an integer
12は3で割わり切きれる整せい数すうだ。
12 is an integer that is evenly divisible by 3.

小しょう数すうN2
整数 (せいすう) means a whole number with no fractional part, while 小数 (しょうすう) is a number that includes a decimal fraction.

自し然ぜん数すう
整数 (せいすう) includes zero and negative whole numbers, whereas 自然数 (しぜんすう) refers only to positive whole numbers starting from 1, so learners often mix up which set is broader.
実じっ数すう
整数 means a whole number (integer), which is only a subset of 実数, the broader category that also includes fractions and irrational numbers.
分ぶん数すうN2
整数 is a whole number such as 3, whereas 分数 represents a part of a whole such as 1/3, so the two terms are often confused when talking about number types.

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Compound of 整 (sei, 'ordered, whole') and 数 (sū, 'number'), reflecting the concept of whole, unbroken numbers.