수학동아 - 폴리매스

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자유게시판

수학을 주제로 떠들어 보세요!

[수학 정보] 암산 꿀팁 22

뉴＿턴 2019.11.29 07:53 조회 957

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

십의 자릿수×십의 자릿수를 곱하는 방법이다. ab×cd일때,

(b×d) (a×c)

(a×d)

(b×c)

를 써서 더한다

예시

69×58

3072

+ 45

-------------

4002

이전글 암산꿀팁(였던것)

다음글 암산꿀팁

추천 0 목록보기

댓글 작성하기

K→C≡N Lv.11 2019.11.29 14:38

밑에밑에 제꺼랑 똑같은거 아닌가요?

댓글 작성하기 좋아요1 댓글수2
- 21세기오일러 Lv.11 2019.11.30 00:44
  
  똑같아요.
  
  좋아요0
- 뉴＿턴 Lv.8 2019.11.30 04:33
  
  오잉? 그렇네요... 삭제할까요??
  
  좋아요0

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