Division
noun
Divide and calculate? Why, that's just division!
わりざん
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!
ママ、割り算のテストで100点取ったよ！
Mom, I got a 100 points on the division test!
なぜか割り算は足し算より得意なんです。
For some reason, I am better at division than addition.
こんな簡単な割り算の問題を間違えちゃったよ。
I got this simple division problem wrong.