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How to say "Addition" in Japanese

Both words can translate to "addition", but which should you choose?

Japanese Option A

足し算

たしざん (tashizan)
N3 / CEFR Syllabus
VS
Japanese Option B

加うるに

くわうるに (kuwauruni)
C1 / CEFR Syllabus

Nuance Contrast & Translation Difference

When translating "addition" into Japanese, you must choose carefully between 足し算 and 加うるに. In Japanese, 足し算 (たしざん (tashizan)) is typically associated with "addition (mathematics)" (Syllabus Level: N3) and represents The mathematical operation of adding numbers.. On the other hand, 加うるに (くわうるに (kuwauruni)) maps to "in addition, moreover" (Syllabus Level: C1) and represents Essential structural term in CEFR C1 vocabulary syllabus.. A literal translation of "addition" can often sound unnatural to native Japanese speakers if mixed up!
Bilingual Context for "足し算"
2足す3は足し算で5になります。
2 plus 3 makes 5 in addition.
Bilingual Context for "加うるに"
私は加うるにに興味があります。
I am interested in in addition, moreover.

Nuance Mastery Quiz

Which Japanese word perfectly fits this blank space?

Fill in the blank: "2足す3は ___ で5になります。" (Meaning: "2 plus 3 makes 5 in addition.")
🎉 Correct Answer!

Remember: "足し算" fits here because it means "addition (mathematics)" in the context of: "2 plus 3 makes 5 in addition.". "加うるに" represents "in addition, moreover".

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