The native numbers ひとつ to とお, which count almost anything, and the ten counters you cannot avoid. Read each word aloud with its reading, then write it once on the line — in kana if you cannot yet write the kanji.
ひとつ number
一つ one (thing)
ふたつ number
二つ two (things)
みっつ number
三つ three (things)
よっつ number
四つ four (things)
いつつ number
五つ five (things)
むっつ number
六つ six (things)
ななつ number
七つ seven (things)
やっつ number
八つ eight (things)
ここのつ number
九つ nine (things)
〜にん counter
〜人 counter for people
〜まい counter
〜枚 counter for flat things (paper, tickets)
〜ほん counter
〜本 counter for long things (pens, bottles)
〜ひき counter
〜匹 counter for small animals
〜だい counter
〜台 counter for machines, vehicles
〜さつ counter
〜冊 counter for books
〜こ counter
〜個 counter for small objects
〜かい counter
〜回 counter for times, occasions
〜さい counter
〜歳 counter for years of age
〜かい counter
〜階 counter for floors of a building