One time (divided by 1): one time, two times, three times, four times, five times, six times, seven times, eight times and nine times.

Two returns (divided by two): every two into one, every four into two, every six into three, every eight into four, 2 1 plus five.

Three returns (divided by three): three into one, six into two, nine into three, three into one, three into two.

Four returns (divided by four): every four enters one, every eight enters two, four two adds five, four twelve is more than two, and four thirty-seven is more than two.

Five cycles (divided by five): every five cycles into one, 5 1 cycle is two, 52 cycles is four, 53 cycles is six, and 54 cycles is eight.

Six returns (divided by six): one every six, six three plus five, six one plus four, six two three greater than two, six four greater than four, and six five greater than two.

Seven returns (divided by seven): every seven enters one, seven plus three, seven plus six, seven plus four, seven plus five, seven plus seven plus one, seven plus eight plus four.

Eight returns (divided by eight): every eight enters one, eight four plus five, eight one plus two, eight two plus four, eight three plus six, eight five six to two, eight six seven to four and eight seven to six.

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

Extended data

The commonly used abacus is made of bamboo and wood, and the beads are fixed side by side in rows, with four borders and beams. You can count the beads by placing them on both sides of the beam, and you can also complete all kinds of complicated calculations such as addition, subtraction, multiplication, division and square root.

To calculate, you can't do without the abacus formula. As early as 1000 years ago, people in China discovered the formula of mathematical calculation, which is simple, easy to remember and catchy. A person can't read, but as long as he can calculate formulas, it doesn't prevent him from becoming a good calculator.

Nowadays, the abacus formula has long gone in people's memory, and some idioms or slang words evolved from abacus formula are still widely used.

"Regardless of the willy-nilly" was originally the formula of abacus multiplication, which was a metaphor for being desperate and not asking right and wrong. Mr. Lu Xun said in "Takeism", "I think the first thing is to' take it' regardless of the willy-nilly!"

"Three-one-three-one-one" is one of the formulas of abacus division, which was later borrowed to evenly distribute three. The fifth time in Legend of Heroes of Children wrote: He thought it was extra money, but when he revealed it to his face, it was only 33 1 1, and each person was 666. "

Baidu encyclopedia: abacus formula