/usr/share/games/xabacus/Abacus5_1.les is in xmabacus 8.0.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | 0 0 0 0 4
Lesson 5.1: Multiplication
This Lesson demonstrates multiplying 23 * 42
Press Space-bar to Begin, press q to Exit
1 0 1 2 4
Lesson 5.1: Multiplication (23*42)
First Represent 23 as 20...
(pending operation)
Press Space-bar to Continue
1 0 0 3 4
Lesson 5.1: Multiplication (23*42)
...and 3.
(This is 23)
Press Space-bar to Continue
2 0 1 4 4
Lesson 5.1: Multiplication (23*42)
We Represent 4 as 40, so...
(pending operation)
Press Space-bar to Continue
2 0 0 2 4
Lesson 5.1: Multiplication (23*42)
...and 2.
(This is 42)
Press Space-bar to Continue
0 0 2 1 4
Lesson 5.1: Multiplication (23*42)
3*4=12
Add 10 part of 12 as 100
Press Space-bar to Continue
0 0 1 2 4
Lesson 5.1: Multiplication (23*42)
Add 2 part of 12 as 20
(For 12)
Press Space-bar to Continue
0 1 0 1 4
Lesson 5.1: Multiplication (23*42)
3*2=6 so add as 5+1.
5....
Press Space-bar to Continue
0 0 0 1 4
Lesson 5.1: Multiplication (23*42)
... 1 part
(For 6)
Press Space-bar to Continue
0 1 2 1 4
Lesson 5.1: Multiplication (23*42)
2*4=8
Add 800 as 500+300, so add 500 (for 626)
Press Space-bar to Continue
0 0 2 3 4
Lesson 5.1: Multiplication (23*42)
and add 300
(For 926)
Press Space-bar to Continue
0 1 1 1 4
Lesson 5.1: Multiplication (23*42)
2*2=4
So... add 40 (as 50 - 10), so first 50 part
Press Space-bar to Continue
0 0 1 -1 4
Lesson 5.1: Multiplication (23*42)
Add -10 part for ...
Result 966
Press Space-bar to Continue
0 0 0 0 4
Conclusion: (End)
Using the auxiliary abaci to keep the multiplicands
and using the primary to add up from the results.
Press Space-bar
|