百
ひゃく · hyaku · JLPT N5 · noun
hundred
💯 hyaku sounds like hi-YAK: say hi to a hundred yaks
百 is the character 白 (white) with an extra stroke 一 (one) on top: one + white = hundred. The reading hyaku shifts after some numbers: 300 is sanbyaku, 600 is roppyaku, 800 is happyaku.
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.