soroban
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soroban

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)
   _____________________________________
    |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 | o o|
    |j o o o o o o o o o o o o o o o o|
    |m 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|_
           
2. Moving to the tens column: 5+3=8
   _____________________________________
    |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 | o o|
    |j o o o o o o o o o o o o o o o o|
    |m 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|_
           
3. Moving to the ones column: 3+9

   oh oh, not enough beads to move in the ones column! okay, so
   add 1 to the tens column (adding 10) and subtract one from the
   ones column.

    3a:
   _____________________________________
    |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 | o o|
    |j o o o o o o o o o o o o o o o o|
    |m 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|_

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

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