実じっ数すう

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Common wordFreq.FrequencyTop 50,000

Meanings

real number

Mathematical term for any number on the continuous number line, including rational and irrational numbers.

actual number; true figure

Used when contrasting a real, confirmed number with an estimate, projection, or nominal value. Common in business, statistics, and reporting.

〈物もの〉は実じっ数すうとするlet 〈x〉 be a real number (common phrasing in math problems)
xは実じっ数すうとする。
Let x be a real number.
〈事こと〉の実じっ数すうを把は握あくするto grasp the actual number/figure for something
感かん染せん者しゃの実じっ数すうを把は握あくするのは難むずかしい。
It's difficult to grasp the actual number of infected people.
実じっ数すうに基もとづいて〈動どう詞し〉to do something based on actual figures (rather than estimates)
実じっ数すうに基もとづいて予よ算さんを組くみ直なおした。
We revised the budget based on the actual figures.

数すう値ちN1sense 2
数値 is the general term for any numeric value, measured or estimated, while 実数 specifically means the confirmed, actual figure.

虚きょ数すう sense 1
虚数 (imaginary number) is the mathematical opposite of 実数 (real number) on the complex plane.
推すい定てい値ち sense 2
推定値 is a number arrived at by estimation or projection, while 実数 is the confirmed, actual figure.

整せい数すうN2sense 1
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.
実じっ績せきN2sense 2
実績 refers to actual achievements or a track record over time, while 実数 is simply a concrete numeric value.
実じっ態たいN1sense 2
実態 describes the true state or reality of a situation and need not involve a number, unlike 実数.

Compound of 実 (real, actual) and 数 (number). The mathematical sense is a direct translation of the Western concept 'real number'.