soroban
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soroban

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

Example with subtracting 128 from 237

traditional method:

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

          -|
        _  _  __
         ) _)  /
        /_ _) /
          _   _
   ___  |  ) (_)
        | /_ (_)
      ___________
              _
             (_)
              /

2. going to the tens column:  3-1-2=0
          -|
        _  _  __
         ) _)  /
        /_ _) /
          _   _
   ___  |  ) (_)
        | /_ (_)
      ___________
           _  _
          | |(_)
          |_| /

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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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
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