Mathematical term referring to a shared denominator in fractions. Used in arithmetic and algebra contexts.
When adding fractions, you first need to make the denominators the same.
For fractions with a common denominator, you only need to compare the numerators.
分母 simply means 'denominator'; 同分母 specifically means 'common denominator' (shared by multiple fractions).
Compound of 同 (same) and 分母 (denominator). A straightforward Sino-Japanese mathematical term.