算筹

算筹或称算木、筭子、算子，是中国、日本、朝鮮半島、越南古代一種十进制计算家生。源于中國商代占卜，筹、策、算三字带个竹头，表示渠拉是用竹头做个。精通用法个算学家也叫「筹人」。

 算筹计数 

算筹具体出现辰光无从可考，但是早在中国春秋战国已经普遍使用。算筹采用十进位制记数方法，同一隻数字来拉弗同数位高头，数值也相应弗同。为著覅让数字搭数位混淆，算筹采用纵式搭横式两種方法记数。

南宋数学家开始用书写算草代替算筹算板。为著减少书写笔劃，4、5、9筹码简化；为著算草需要，引入〇符号。

+ 算筹正数（早期）    1 2 3 4 5 6 7 8 9 直式 File:Counting rod v1.png File:Counting rod v2.png File:Counting rod v3.png File:Counting rod v4.png File:Counting rod v5.png File:Counting rod v6.png File:Counting rod v7.png File:Counting rod v8.png File:Counting rod v9.png 横式 File:Counting rod h1.png File:Counting rod h2.png File:Counting rod h3.png File:Counting rod h4.png File:Counting rod h5.png File:Counting rod h6.png File:Counting rod h7 num.png File:Counting rod h8 num.png File:Counting rod h9 num.png

+ 负数   -1 -2 -3 -4 -5 -6 -7 -8 -9 直式 File:Counting rod v-1.png File:Counting rod v-2.png File:Counting rod v-3.png File:Counting rod v-4.png File:Counting rod v-5.png File:Counting rod v-6.png File:Counting rod v-7.png File:Counting rod v-8.png File:Counting rod v-9.png

+ 算筹正数（晚期）     1 2 3 4 5 6 7 8 90 直式 File:Counting rod v1.png File:Counting rod v2.png File:Counting rod v3.png File:Counting rod 4 song.png File:Counting rod v5 song.png File:Counting rod v6.png File:Counting rod v7.png File:Counting rod v8.png File:Counting rod v9 song.pngFile:Counting rod 0.png 横式 File:Counting rod h1.png File:Counting rod h2.png File:Counting rod h3.png File:Counting rod 4 song.png File:Counting rod h5 song.png File:Counting rod h6.png File:Counting rod h7 num.png File:Counting rod h8 num.png File:Counting rod h9 song.pngFile:Counting rod 0.png

日本数学家关孝和拿算筹用于代数。后首日本数学家又发明用汉字代替算筹。

 现代  关孝和  后关孝和 x + y + 246 File:Counting rod v1.png甲File:Counting rod v1.png乙File:Counting rod v2.pngFile:Counting rod h4.pngFile:Counting rod v6.png File:Counting rod v1.png甲File:Counting rod v1.png乙File:Counting rod v1.png二四六 5x - 6y File:Counting rod v5.png甲File:Counting rod v-6.png乙 File:Counting rod v1.png五甲File:Counting rod v-1.png六乙 7xy File:Counting rod v7.png甲乙 File:Counting rod v1.png七甲乙 8x / y N/A 乙File:Counting rod v1.png八甲