“to divide / proportion” in Japanese is 割, read katsu, wa (かつ, わ). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 割合 (ratio).
What does 割 mean?
りんごを半分に割る。
Same sound, different character — the classic trap. Compare them side by side: