足し算|たしざんtashizan[2]nakadaka (mid-high)

1. noun, mathaddition
   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.

• Synonym加算かさんWrittenFormal term for adding numbers or quantities, also for an added charge or calculation as in 「料金加算」; more formal than 「足し算」.
• SynonymプラスNeutralLoanword meaning plus, a positive number or a benefit; wide-ranging in use and very common in everyday speech.
• Synonym寄せ算よせざんNeutralOld-fashioned word for addition, rarely used nowadays; 「足し算」 is the everyday term taught in elementary school.
• Synonym加え算くわえざんNeutralAnother old-fashioned word for addition with few examples in actual use; say 「足し算」 in daily life and 「加法」 in writing.
• Synonym加法かほうWrittenThe mathematical term for addition, used in written and technical contexts; in everyday speech people say 「足し算」.
• Antonym引き算ひきざんNeutralSubtraction, as in 「引き算の問題」; the operation directly opposite to 「足し算」.

Use 「足し算」 for addition in everyday speech and elementary math. 「加法」 is the mathematical term, 「加算」 the formal word for adding amounts or fees, and 「プラス」 covers plus signs and benefits. 「引き算」 is subtraction. 「寄せ算」 and 「加え算」 are dated alternatives.

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

1. ある数かずにほかの数かずを足たして合計ごうけいを求もとめる計算法けいさんほう。加算かさん。寄せ算よせざん。加え算くわえざん。
2. ものごとの構築こうちくを、さまざまなものを組み合くみあわせていくという発想はっそうで行おこなうこと。