The price is ８８０円 — did you catch what the cashier said?

Japanese numbers are beautifully regular right up until they aren't — and the irregular readings cluster exactly where daily life happens: prices and clock times. Textbooks bury these in chapter nine; the konbini register quizzes you on them today.

The hundreds and thousands that change shape

That's the whole irregular set for money. A ¥380 onigiri run is さんびゃくはちじゅう円 — one irregular, right at the front, where it decides whether you understood anything.

Clock times: three famous exceptions

Hours are 〜時 (じ) and behave — except 4:00 is よじ (never よんじ), 7:00 is しちじ, and 9:00 is くじ (never きゅうじ). Store hours signs (営業時間 9:00〜18:00) give you daily reading practice; the station announcer gives you the listening version.

The register script

Every konbini transaction runs the same five lines. 袋はご利用ですか — "do you need a bag?" (はい / そのままで大丈夫です). ポイントカードはお持ちですか — "do you have a point card?" (ないです works fine). Then the total, fast: 千二百三十円になります. Learn the skeleton and the whole interaction stops being noise.

Drill it the way Japan says it

Yokoso generates price and time drills with the irregulars weighted by what you miss, mixed into your reviews every few questions — because this is the one part of Japanese the country tests you on daily, for free. Pairs well with the signs guide — 無料, 有料, and 割引 are where numbers meet the wild.