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Lesson 1.5: Multiplication
This Lesson demonstrates multiplying 23 * 42

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Lesson 1.5: Multiplication (23*42)
First Represent 23 as 20...
(pending operation)
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Lesson 1.5: Multiplication (23*42)
...and 3.
(This is 23)
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Lesson 1.5: Multiplication (23*42)
We Represent 4 as 40, so...
(pending operation)
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Lesson 1.5: Multiplication (23*42)
...and 2.
(This is 42)
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Lesson 5.1: Multiplication (23*42)
3*4=12
Add 10 part of 12 as 100
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Lesson 5.1: Multiplication (23*42)
Add 2 part of 12 as 20
(For 12)
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Lesson 5.1: Multiplication (23*42)
3*2=6  so add as 5+1.
5....
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Lesson 5.1: Multiplication (23*42)
... 1 part
(For 6)
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Lesson 5.1: Multiplication (23*42)
2*4=8
Add 800 as 500+300, so add 500 (for 626)
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Lesson 5.1: Multiplication (23*42)
and add 300
(For 926)
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Lesson 5.1: Multiplication (23*42)
2*2=4
So... add 40 (as 50 - 10), so first 50 part
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Lesson 5.1: Multiplication (23*42)
Add -10 part for ...
Result 966
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Conclusion: (End)
Using the auxiliary abaci to keep the multiplicands
and using the primary to add up from the results.
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