soroban

   3a
   _____________________________________
    |o o o o o o o o o o o o o o o | ||
    ||_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_o|
    || | | | | | | | | | | | | | o | o|
    |o o o o o o o o o o o o o o ...

Example with subtracting 128 from 237

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

   1a
   _____________________________________
    |o o o o o o o o o o o o o o o | |...

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...)

        ...

   3b:
   _____________________________________
    |o o o o o o o o o o o o o o o | o|
    ||_|_|_|_|_|_|_|_|_|_|_|_|_|_|_o_||
    || | | | | | | | | | | | | | o o o|
    |e o o o o o o o o o o o o o...

Adding 153 to 39 with the soroban:

1. Put 153 onto the soroban, then starting with the hundreds column: 1+0=1
(89 is less than 100 so zero is the number in the 100's column for it)
   _______________...

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
           |
           _  _
        | |_  _)
        |  _...

Keldon Class

         __.-------.----.   ____    ===____          _____===_____
   ____ /__________|_____\_/n___\__/.------'  ______/-------------\______
(=|====\--'--------------`----------'[)      ...

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         /     \ \ \O_ / / /     )  +
      .  |#    |\ \...