Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
roku (num) sixjlpt5
ichi onejlpt5
五つ itsutsu fivejlpt5
十億 juuoku 1,000,000,000, billion (American), (obs) milliard (British)mix
oku (num) 100,000,000, hundred millionjlpt4