This is also 一 (One) added to 二 (Two) if you want to think about it that way.
三 - Three
This kanji looks like the Roman numeral III (three) laying on its side.This is also 一 (One) added to 二 (Two) if you want to think about it that way.
All Mnemonics (2)
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三 - Three
Index # 3
Grade 1
3 strokes
JLPT Level : N5
Readings : サン, み, みっ・つ