noun
proper fraction
Mathematical term for a fraction where the numerator is less than the denominator (e.g., 1/2, 3/4).
真分数は、分子が分母より小さい分数です。
A proper fraction is a fraction where the numerator is smaller than the denominator.
Compound of 真 (true, proper) and 分数 (fraction). The term is a direct calque from English 'proper fraction'.