0 0 0 0 4
Lesson 2.1: Counting down from 19 to 0 for Russian 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 
Press Space-bar to Continue
0 0 0 9 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

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
16

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
15

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
14

Press Space-bar to Continue
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

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
11

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
10

Press Space-bar to Continue
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 0 0 9 4
Lesson 2.1: Counting Down
Adding the 9 in to get
9
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0 0 0 -1 4
Lesson 2.1: Counting Down
8

Press Space-bar to Continue
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

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
5

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
4
 
Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
3

Press Space-bar to Continue
0 0 0 -1 4
Lesson 2.1: Counting Down
2

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

Press Space-bar to Continue
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