How to Multiply Using a Soroban (Japanese Abacus) - Part 1: Left-to-Right Multiplication
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- เผยแพร่เมื่อ 28 มิ.ย. 2024
- In order to multiply using the soroban, the ability to perform left-to-right multiplication is essential. Here in Part 1 I demonstrate, using pencil and paper, the process of left-to-right multiplication for those who are unfamiliar with the algorithm. Part 2 continues by showing left-to-right multiplication on the soroban.
Hi,
I am 13 years old and bought a soroban yesterday afternoon. With your videos, I already learned how to add, subtract and multiply. I can already do 3 complex multiplication problems a minute. I hope to advance in the future. They are very easy to understand and are very useful to someone new to Soroban. I never thought I could learn so much in a day. Thank you so much!
You should consider publishing these on video and selling them. I would definitely purchase them.
what happened?
Great intro to multiplying on soroban! I haven't found a whole lot of resources, so this was really helpful. In fact, I didn't even need to watch Part 2, because of how clear the setup is here. Now it's just adding left-to-right like I'm already used to. Thanks again one Chicagoan to another
I use the soroban in part 2. I decided to split up this video into two parts because not as many people are familiar with L to R multiplication, and I thought it'd be less confusing to explain the process with pencil and paper instead of with the soroban.
[QUESTION] Thank you for making this video! I'm glad that you started on pencil and paper and showed us how you can multiply from left-to-right. b/c when I was learning addition and subtraction from another very good playlist(though they did not have multiplication and division) they did not quite explain that abacus arithmetic was L to R. But I understood after observing it more, and guessing why.
My question is- whether you can know if the number value will carry or not to the column you are working on- w/o looking at the column to the right. And if so, how can you know what number value will be carried(if it is a 1, 2 or 3 etc.)
Thank you very much for these tutorials. I appreciate your effort and patience in your teaching. you're the best teacher on youtube. may I know if you have tutorial on division and squareroot? thank you in advance!
Thanks for the input. Sorry - didn't mean to be confusing! What I was trying to do was "think out loud" to help lay the groundwork for doing the multiplication on the soroban ~
You're welcome - glad to hear it was helpful ;)
thx, that's so helpful (y)
Left-to-right addition with carry forecasting XD
I feel like it would have been a little more simple if instead of saying "there will be a carry so this will be that" you were to do the math how it is shown and carry the number on paper. Just a confused students input though. Thank you for the video.
Good video. I didn't understand how you worked out the carry though.
Can anybody please explain these left to right "carries" to me?
Can you please post Two digit X three digit?
Left-to-right multiplication can seem like a mystery if you're not used to it, but it is crucial - all arithmetic on the soroban is based on L-R computations. It also makes more sense, since that's how we read/speak the numbers. It's not an issue of a particular method being better or worse, but it is true that some methods are more efficient than another - and it can be argued that L-R computation is more efficient ;)
Example #3 took quite a bit of time to write out in the fashion performed. Was able to multiply #3 in 11 secs (with the right answer). I trust that using the abacus will not require as much formula manipulation to arrive at the answer.
Well, the pace in the video is slower since it is accompanied by an explanation - of course, when you do it yourself, you don't have to explain ~ and practice would make the process even faster ;)
clubenglish
I'm trusting practice will enable me to process faster. I've ordered one out of curiosity, and looking forward to working with the soroban. I've always been rather speedy with multiplication (for reasons unknown). Looking to add long columns of figures.
Have fun! I'm sure you will :) What's really neat about working with the soroban is that if you practice it often enough and get really good at it, you'll be able to do it in your head - called "anzan" ;D
cant see a soroban
When you multiply 357x82 you first multiply 357 by 80, than 357 by 2 and add to get the result. If you are multiplying by 80, why not just put a zero behind instead of drawing 4 lines? It would be much faster and less confusing.
The process is a little different with L2R multiplication, which is what I'm trying to illustrate so the abacus multiplication will make a little more sense.
Drawing your position lines (1's, 10's, 100's, etc.), or even putting much thought into your columns, is quite unnecessary. It does not matter where you start your answer. Work left to right on your soroban (or paper). As you take on each new digit in the multiplicand (the bottom number) start one position to the right of where you started with the previous multiplicand digit. When there are not more digits to multiply, you're done. If you had any zeroes at the right end of either the multiplier or multiplicand, count them all up and put the on the right end of your result. Read off your result from left to right.
The position lines are meant as a bookkeeping tool - strictly speaking, not necessary but tremendously helpful for those of us who learned R to L multiplication. Thanks for watching ;)
please help me represent the following no in abacus 610521 [2]786431 [3] 123521
ужасный способ умножения. Это все равно что одевать штаны через голову. Можно эти примеры решить быстрее в 3 раза, если умножать не слева направо, а наоборот справа налево.
+маргарита Well, that's the way multiplication (as well as the other operations - addition, subtraction, and division as well) is performed on the abacus ~
This multiply method is the worst I ever seen. I do not wonder why english people afraid about calculation.