page_title: Chisanbop
section_title: Basic concepts
hierarchical_section_title: Chisanbop / Basic concepts
caption_attribution_description: English: Chisanbop: pressed fingers for showing number 36 Deutsch: Chisanbop: aufgedrückte Finger zeigen die Zahl 36
context_page_description: Chisanbop or chisenbop is an abacus-like finger counting method used to perform basic mathematical operations. According to The Complete Book of Chisanbop by Hang Young Pai, chisanbop was created in the 1940s in Korea by Sung Jin Pai and revised by his son Hang Young Pai. He then brought the system to the United States c. 1977.
  With the chisanbop method it is possible to display all numbers from 0 to 99 on two hands, and to perform the addition, subtraction, multiplication and division of numbers. The system has been described as being easier to use than a physical abacus by students with visual impairments.
context_section_description: The hands are held in a relaxed posture on or above a table. All fingers are floating off the table to begin with. The fingers are pressed into the table to indicate value.
  Each finger (but not the thumb) of the right hand has a value of one. Press the index finger of the right hand onto the table to indicate "one." Press the index and middle fingers for "two," the three leftmost fingers for "three," and all four fingers of the right hand to indicate "four." 
  The thumb of the right hand holds the value "five." To place the value "six," press the right thumb and index finger onto the table. The thumb indicates "five" plus the "one" indicated by the finger.
  The left hand represents the tens digit. It works like the right hand, but each value is multiplied by ten. Each finger on the left hand represents "ten," and the left thumb represents "fifty." In this way, all values between zero and ninety-nine can be indicated on two hands.
caption: 36 represented in chisanbop, where four fingers and a thumb are touching the table and the rest of the hands are raised. The three fingers on the left hand sum to 30, the right thumb adds 5, and the right index finger adds 1.
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