Division
noun
Divide and calculate? Why, that's just division!
This is the kun'yomi reading for 割 and the on'yomi for 算. And the さん reading is rendaku'd into ざん. This is the same for all the math-ish words (addition, subtraction, multiplication, and division), so try to remember that, because you'll see it again!
こんな簡単な割り算の問題を間違えちゃったよ。
I made a mistake on such a simple division problem.