noun
Mathematical term referring to a shared denominator in fractions. Used in arithmetic and algebra contexts.
分数の足し算では、まず同分母にそろえる必要がある。
When adding fractions, you first need to make the denominators the same.
同分母の分数は分子だけを比べればよい。
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.