Calculation on the abacus
Generally the calculation on a piece of paper by the handwriting stops to 10 / 100 / 1,000 / ten thousand and the number of the higher figures from a unit and calculates it, but I go down to a sequentially downward figure from a high-ranking figure by the calculation on the abacus and calculate it.
There are some kinds on an abacus historically, but, as for what is used for calculation on the abacus generally, the thing which five balls line up is used for 1 line in height.
I explain a calculation method by the general calculation on the abacus as follows.
In the calculation on the abacus, one line of the length will express the figure of the one of the decimal systems.
I appoint a specific place by oneself voluntarily and treat the part as a unit and I treat a line of the left as a thing expressing 10 digit, 100 rank and the rank mentioned above sequentially, and the right side depends than a unit as I go to decimal the first place, the second place and the right and will express low-ranking rank.
When I express beginning, as for each rank, one ball divided by the upper part lets you locate so that four other balls are lowered to the top below, and space for the top and bottom person ball of the end produces it.
I return an abacus evenly after I incline the whole abacus for a motion so that this side becomes it below, and all balls went down below and will move a forefinger in parallel with an end aside from the left to the right so that the ball of the biggest one of each figures is located in the upper depths.
It is it with operation of the oar clear of the place where it says to with an electronic calculator that the state that all rank expresses a zero returns to this at a basic position.
I express one first value in the case of the simple addition on a board side and will repeat operation to add a value to add to it sequentially.
The process by a thing of the addition does not change with the process of the calculation on a piece of paper except that it is calculated by high-ranking rank.
For example, I express 356 on the abacus which I returned to the basic position without receiving it when I calculate 356+872 and I add 1156, 70 by adding 800 from the high rank and add 1226, 2 and will move a board side with 1228 sequentially.
I operate it to become the right sequentially most from the left.
Because the result of the sum of 2 value is just left in the board side, I can add a value sequentially sequentially.
Because I can calculate in succession when I add up all the many values by account books, it is convenient.
I am separated by a calculation on the abacus competition and a mental arithmetic competition when I classify roughly.
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