百
bǎi · HSK 1
hundred
💯 百 = one 一 on top of 白 (white); old graph for 'hundred'
Top stroke 一 marks 'one [hundred]', sitting over 白 bái (white), which doubles as the phonetic — 白 bái → 百 bǎi. Shows up in 百分 bǎifēn (percent) and 百年 bǎinián (century).
百 — 一 (one) on top of 白 (white)
百 means 'hundred.' It combines 一 (one) above 白 (white), where 白 here is borrowed for its sound rather than its meaning. Some scholars see it as derived from an early form of 白 with an added stroke to mark the new numerical sense.