The counters for specific situations — floors (かい), books (さつ), cups & drinks (はい), age (さい, plus はたち=20), order & rank (ばん), times & degrees (ど), and money (えん). Each has its own sound changes.

• いっかいikkai1st floor / once (one time)
• にかいnikai2nd floor / twice (two times)
• さんがいsangai3rd floor (also さんかい sankai)
• なんがいnangaiwhich floor? (also なんかい nankai)
• さんかいsankaithree times
• なんかいnankaihow many times?
• いっさつissatsuone book / one volume
• にさつnisatsutwo books / two volumes
• さんさつsansatsuthree books / three volumes
• なんさつnansatsuhow many books? / how many volumes?
• いっぱいippaione cupful/glassful (drinks, bowls); counter 杯 — sound change to ぱい. Note: いっぱい also means 'full / a lot'.
• にはいnihaitwo cups/glasses; counter 杯 — no sound change, stays はい
• さんばいsanbaithree cups/glasses; counter 杯 — sound change はい→ばい
• なんばいnanbaihow many cups/glasses?; counter 杯 — sound change to ばい
• いっさいissaione year old (age); counter 歳/才 — sound change to っさい
• にさいnisaitwo years old; counter 歳/才
• はたちhatachitwenty years old (二十歳) — irregular reading (not にじゅっさい)
• なんさいnansaihow old?; counter 歳/才 (おいくつ is more polite)
• いちばんichibannumber one / first / most (counter 〜番) — order & rank
• にばんnibannumber two / second (counter 〜番)
• なんばんnanbanwhat number? (e.g. platform, phone); counter 〜番
• いちどichidoonce / one time (counter 〜度) — also counts degrees (temperature)
• にどnidotwice / two times (counter 〜度)
• なんどnandohow many times? / how many degrees?; counter 〜度
• いちえんichienone yen (counter 〜円) — money; higher numbers stay regular (にえん, さんえん)