What does 足し算 mean?
足し算 is a Japanese noun meaning “addition” in English. It is written as 足し算 in kanji, たしざん in hiragana, and tashizan in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
うちの息子はまだちゃんと足し算ができない。
My boy can't do addition properly yet.