0 0 0 0 4
Lesson 2.1: Counting down from 19 to 0 for Korean Abacus
The beads will move at each step with an
appropriate explanation in this window.
Press Space-bar to Begin, press q to Exit
0 0 1 1 4
Lesson 2.1: Counting Down
One bead in 10ths column
10 
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0 1 0 1 4
Lesson 2.1: Counting Down
Plus one bead in 5ths column
15
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0 0 0 4 4
Lesson 2.1: Counting Down
Plus 4 beads in ones column
19  ok now we are ready to start
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0 0 0 -1 4
Lesson 2.1: Counting Down
Move one bead down to get
18
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0 0 0 -1 4
Lesson 2.1: Counting Down
17

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0 0 0 -1 4
Lesson 2.1: Counting Down
16

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0 0 0 -1 4
Lesson 2.1: Counting Down
15

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0 1 0 -1 4
Lesson 2.1: Counting Down
14   Subtract 5 from top deck by moving
it up (but we are not done yet...)
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0 0 0 4 4
Lesson 2.1: Counting Down
add 4 to get...
14
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0 0 0 -1 4
Lesson 2.1: Counting Down
13

Press Space-bar
0 0 0 -1 4
Lesson 2.1: Counting Down
12

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0 0 0 -1 4
Lesson 2.1: Counting Down
11

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0 0 0 -1 4
Lesson 2.1: Counting Down
10

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0 0 1 -1 4
Lesson 2.1: Counting Down
9  Subtract the tens place out
but we are not done yet...
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0 1 0 1 4
Lesson 2.1: Counting Down
9  Adding 5 + 4 back in so first
the 5...  (pending operation)
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0 0 0 4 4
Lesson 2.1: Counting Down
Adding the 4 in to get
9
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0 0 0 -1 4
Lesson 2.1: Counting Down
8

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0 0 0 -1 4
Lesson 2.1: Counting Down
7

Press Space-bar
0 0 0 -1 4
Lesson 2.1: Counting Down
6

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0 0 0 -1 4
Lesson 2.1: Counting Down
5

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0 1 0 -1 4
Lesson 2.1: Counting Down
4 but wait now...
(pending opertation)
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0 0 0 4 4
Lesson 2.1: Counting Down
Add four to get
4
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0 0 0 -1 4
Lesson 2.1: Counting Down
3

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0 0 0 -1 4
Lesson 2.1: Counting Down
2

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0 0 0 -1 4
Lesson 2.1: Counting Down
1

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0 0 0 -1 4
Lesson 2.1: Counting Down
0
Done.
Press Space-bar to Continue
0 0 0 0 4
Conclusion:
When subtracting 1 from 10
you take away 10 and add 9.
Press Space-bar
0 0 0 0 4
Conclusion: (End)
When subtracting 1 from 5
you take away 5 and add 4.
Press Space-bar