Dragon Ball Episode 91: Counting Controversy!
Episode 91 of 153 of Dragon Ball, aired December 9, 1987, 25 minutes. Available with English subtitles and dub where released.
Episode summary
The match continues, in which Chiaotzu launches something even worse than the Dodon Wave against Krillin. Krillin's only chance to catch Chiaotzu off guard is the most unexpected technique in martial arts: math. But long after the match is over, Goku and Krillin learn there is more at stake than the championship as Master Shen wants revenge for Goku defeating Tao.