soroban
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soroban

From llizard aka ejm:

Example with the numbers 153 and 39

traditional western method:

1. starting in the ones column:  3+9=12, carry the 1
           |
           _  _
        | |_  _)
        |  _) _)
           _  _
   _|_     _)(_)
    |      _) /
      ___________
              _
               )
              /_

2. moving to the tens column: 1+5+3=9
           |
           _  _
        | |_  _)
        |  _) _)
           _  _
   _|_     _)(_)
    |      _) /
      ___________
           _  _
          (_)  )
           /  /_

3. moving to the hundreds column: 1+0=1
           |
           _  _
        | |_  _)
        |  _) _)
           _  _
   _|_     _)(_)
    |      _) /
      ___________
           _  _
        | (_)  )
        |  /  /_

Source: https://ascii.co.uk/art/soroban

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Example with subtracting 128 from 237

1. Put 237 onto the soroban, then starting with the hundreds column: 2-1=1

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Lesson 2 (from llizard's bbackwards sschool of soroban)

Example with subtracting 128 from 237

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1. starting in the ones column:  7-8=9 (take one from the tens column...)

        ...
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Adding 153 to 39 with the soroban:

1. Put 153 onto the soroban, then starting with the hundreds column: 1+0=1
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