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加減法口訣
加減法口訣
更新时间:2025-11-04 17:51:43

  1、兩位數加兩位數的進位加法: 口訣:加9要減1,加8要減2,加7要減3,加6要減4,加5要減5,加4要減6,加3要減7,加2要減8,加1要減9。

  2、兩位數減兩位數的退位減法。口決: 口訣:減9要加1,減8要加2,減7要加3,減 6要加4,減 5要加5,減4要加6,減 3要加7,減 2要加8,減 1要加9。

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