既約分数(きやくぶんすう)

きやくぶんすう
noun
irreducible fraction; fraction in lowest terms
academicnumbereducation
1. irreducible fraction; fraction in lowest terms
A fraction whose numerator and denominator have no common factor other than 1, such as 1/2 or 3/4. A school mathematics term: answers are usually asked for in this form.
既約分数(きやくぶんすう)に直(なお)す。
To reduce (a fraction) to lowest terms.
答(こた)えは既約分数(きやくぶんすう)で書(か)きなさい。
Write your answer as a fraction in lowest terms.
4分(ぶん)の2を約分(やくぶん)すると、既約分数(きやくぶんすう)の2分(ぶん)の1になる。
Reducing two quarters gives the irreducible fraction one half.

既約(きやく) means "already reduced": the fraction cannot be reduced any further.

Related words

Related Words

Related: 約分(やくぶん) (reducing a fraction)
Related: 最大公約数(さいだいこうやくすう) (greatest common divisor)
general
Added 2026.10.13 9:19 · Revised 2026.10.13 9:27
31500/31971_kiyakubunsuu