noun
lower grades of elementary school
Typically refers to first and second graders, sometimes including third grade. Used in school contexts to distinguish from 中学年 (middle grades) and 高学年 (upper grades).
低学年の児童には、わかりやすい説明が必要です。
For children in the lower grades, easy-to-understand explanations are necessary.
このイベントは低学年向けに企画されました。
This event was planned for the lower grades.