Multiplication on abacus uses this rule of algebra "(a+b) * (c+d) = ac+ad+bc+bd".
We must choose a and c from the tens and b and d from the ones. For example: 34*12=(30+4)*(10+2)=30*10+30*2+4*10+4*2=300+60+40+8=408.
Thank you very much for your good tutorial. I did not know anything about abacus and multiplications on it. And I am going to watch other videos about abacus to learn more!
@abacusma Hi. I have not bought an abacus yet! When I buy it, I will try to watch more videos especially about division and squaring and cubing and I will try to ask you for help. I hope you will reply to me and help me learn much more!
Comment removed
revilogmail 2 months ago
Multiplication on abacus uses this rule of algebra "(a+b) * (c+d) = ac+ad+bc+bd".
We must choose a and c from the tens and b and d from the ones. For example: 34*12=(30+4)*(10+2)=30*10+30*2+4*10+4*2=300+60+40+8=408.
Thank you very much for your good tutorial. I did not know anything about abacus and multiplications on it. And I am going to watch other videos about abacus to learn more!
rezacatt 5 months ago
@rezacatt
Thank you very much. We will post more videos of AbacusMaster tutorial.
Regards,
AbacusMaster
abacusma 5 months ago
@abacusma Hi. I have not bought an abacus yet! When I buy it, I will try to watch more videos especially about division and squaring and cubing and I will try to ask you for help. I hope you will reply to me and help me learn much more!
Regards,
Reza
rezacatt 5 months ago
@abacusma I don't understand how you got 86 x 37 = 3182!
Please Explain
reviver96 4 months ago
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@reviver96
8x3=24
8x7=56
6x3=18
6x7=42
24+56+18+42=3182
Simples.
revilogmail 2 months ago
I am not any expert but this is very well done and thanks for the tutorial it reallllyy helped :)
amystefen 8 months ago
WOW!!! this is amazing.. superb animations.. multiplication rocks..
shabeebcool 8 months ago