It's all the same word. The root is ח.ש.ב (kh.sh.b), which means thinking.
So your account at the bank, the study of mathematics and the bill at the restaurant are all חֶשְׁבּוֹן (khesh-BOHN).
Learn Hebrew, one dose at a time.
brought to you by Ami Steinberger and his Hebrew-language school, Ulpan La-Inyan
