The abacus is a form of manually operated calculation aid and is a widely used calculation tool in the world. Below I will share the abacus formula table and how to play it. I hope it will be helpful to you. It is for reference only.

1. Addition formula

How to play: Abacus addition formula is a text used to guide the movement of beads and perform calculations. Summarize. In order to understand the content of the formula more clearly, the meaning of the relevant terms in the addition formula is briefly described as follows:

"Shang" refers to the beam on which the beads are placed.

"下" refers to moving the upper beads against the beams.

"Go" means to move the beads that are leaning against the beam to the side.

"Advance" means adding the number to the previous position (left gear).

2. Subtraction formula

How to play: Twenty-six sentences of abacus subtraction formula, divided into direct subtraction, breaking five subtractions, and retreating ten subtractions And retreat ten, supplement five and reduce four. The meaning of relevant terms in the subtraction formula:

"Shang" refers to pulling down the beads and leaning against the beam.

"下" refers to pulling the beads away from the beam and to the side.

"Go" means to move the beads away from the beam and move them to the side.

"Advance" refers to adding the number to the previous position (left gear).

"Return" refers to subtracting from the previous position (left gear).

"Also" means that after subtracting the first digit, the number should be added to the original digit.

3. Multiplication formula

4. Nine-return formula

One return (divided by 1): Every time one advances to one, Every two goes into two, every three goes into three, every four goes into four, every five goes into five, every six goes into six, every seven goes into seven, every eight goes into eight, and every nine goes into nine.

Two returns (divided by 2): every two goes into one, every four goes into two, every six goes into three, every eight goes into four, and two and one add to make five.

Three returns (divided by 3): every three will make one, every six will make two, every nine will make three, three, one, three will make one, and three, two, six will make two.

Four returns (divided by 4): every four makes one, every eight makes two, four and two add to make five, four and one and two make two, four and three and seven make two.

Five returns (divided by 5): when five is added, one is added, five times is doubled to make two, five to two times is made to four, five or three times is made to six, and five or four times is made to eight.

Six returns (divided by 6): every six adds one, every twelve adds two, six three adds five, six one adds four, six two three leaves two, six four six leaves four, Sixty-five-eight and two more.

Seven returns (divided by 7): every seven makes one, every fourteen makes two, seven adds three to one, seven to two adds six, seven, three, and four leave two, seven, four, and five leave five. Seventy-five-seven means more than one, and seven-sixty-eight means more than four.

Eight returns (divided by 8): Every eight adds one, eighty-four adds five, eighty-one adds two, eighty-two adds four, eighty-three adds six, and eighty-five and six leave two. Eighty-sixty-seven is more than four, eighty-seven is more than six.

Nine returns (divided by 9): every nine adds one, nine one adds one, nine two adds two, nine three adds three, nine four adds four, nine five adds five, Add six to ninety-six, seven to ninety-seven, and eight to ninety-eight.