How to say "addition" in Japanese

• 追加ついかJLPT N2approx.Common
  suru verb, transitive verb, no-adjectiveThe general word for an addition in the sense of something added on — appending an item, supplementing what exists. Choose it whenever you add more to something already there, such as an item or section.
  名簿めいぼに私の名前なまえも追加ついかしてください。↗

  Please add my name to the list.
• プラスJLPT N3approx.Common
  noun, suru verb, transitive verb, conjunction, prefix, suffixMainly the word for 'plus' — the sign in arithmetic, or a positive point, as in 'a plus'. It is seldom the word you want for addition as an operation; that is 足し算.
• 添加てんかCommon
  noun, suru verb, transitive verbAddition in the sense of mixing a substance or ingredient into something — the domain of additives. It is not the word for adding items to a list or for doing sums.
• 足し算たしざんJLPT N1approx.Common
  nounAddition as the arithmetic operation — the sums you do in school, the counterpart of subtraction. This is the word when 'addition' means calculating a total, not adding something to a collection.
  うちの息子むすこはまだちゃんと足し算たしざんができない。↗

  My boy can't do addition properly yet.
• 加算かさんCommon
  na-adjective, noun, suru verb, transitive verbAdding numbers or amounts together, or an amount added on, such as an extra charge. Use it when addition means a calculated total or added amount, not an appended item.
  あなたの給与きゅうよは一定いっていの基本給きほんきゅうに販売手数料はんばいてすうりょうが加算かさんされます。↗

  You will be paid a stable base salary plus commissions on sale.

Use 追加 for adding something extra to what already exists, 「足し算」 for the arithmetic operation, 加算 for summing numbers or amounts, 添加 for adding substances or ingredients, and 「プラス」 chiefly for 'plus'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 追加ついかaddition
• プラスplus
• 添加てんかaddition
• 足し算たしざんaddition
• 加算かさんaddition
• 付加ふかaddition
• 加かaddition
• 積算せきさんaddition
• 添え物そえものaddition
• 付記ふきaddition
• 付け加えつけくわえaddition (to something)
• 増加ぞうかincrease
• 付けたりつけたりaddition
• 加法かほうaddition
• 継ぎ足しつぎたしaddition
• 付け足しつけたしaddition
• 加え算くわえざんaddition
• 寄せ算よせざんaddition
• 付かたりつかたりaddition
• 補記ほきaddition (to a text)
• 加増かぞうincrease
• 足し前たしまえsupplement
• 増加分ぞうかぶんincrement
• プラスオンextras
• 追加額ついかがくadd-on
• おまけaddition
• 加味かみaddition
• 追記ついきappending
• あしらいarrangement