01 The abacus formulas include addition formulas, subtraction formulas, multiplication formulas, and division formulas. The addition formula is as follows: One: one up, one down, five down, four, one down, nine, one; two: two up, two, two down five, three, two down, eight, one, etc.
The abacus is a form of manually operated calculation aid. It originated in China and has a history of more than 2,600 years. It is an important invention in ancient China. Before the advent of Arabic numerals, the abacus was a widely used calculation tool around the world. The abacus formulas include addition formulas, subtraction formulas, multiplication formulas, and division formulas.
1. Addition formula
Add directly, add up to five, add up to ten, add up to ten after five points
One: one up, one down, five, go to four One goes to nine and goes into one
Two: Two up two goes down five goes into three two goes eight goes into one
Three: Three up three goes down five goes into two and three goes to seven goes into one
Four: four up four four down five go one four go six go into one
Five: five up five five go five go into one
Six: six up six Six goes up, four goes into one, six goes up, one goes up, five goes into one
Seven: seven goes up, seven goes up, three goes into one, seven goes up, two goes, five goes into one
Eight: eight goes up, eight goes up Two into one, eight up, three up, five into one
Nine: nine up, nine up, nine up, one into one, nine up, four up, five up, five into one
2. Subtraction formula
Deduction for those who do not abdicate, reduction for those who abdicate
Straight reduction, reduction for breaking five, reduction for abdication, reduction for ten to make up for five
One: one by one, four, five, one retreat One for nine
Two: two for two, two for three, five for two, one for eight
Three: three for three, three for three, two for five, three for five, one for seven
>Four: four down four four up one go five four back one back to six
Five: five down five five back down one back to five
Six: six down six six back down One for four and six, one for five and one for return
Seven: seven for seven and seven for one and three and seven for one and five for two
Eight: eight for eight and eight for one and return Two and eight go back to one and return five and go to three
Nine: Nine goes back to nine and nine goes back to one and nineteen goes back to one and five goes back to four
3. Multiplication formula (big nine-nine formula table)
One one 01 one two 02 one three 03 one four 04 one five 05 one six 06 one seven 07 one eight 08 one nine 09
two one 02 two two 04 two three 06 Two four 08 two five 10 two six 12 two seven 14 two eight 16 two nine 18
Three one 03 three two 06 three three 09 three four 12 three five 15 three six 18 three seven 21 three eight 24 three nine 27
four one 04 four two 08 four three 12 four four 16 four five 20 four six 24 four seven 28 four eight 32 four nine 36
five one 05 five two 10 five three 15 five four 20 five five 25 five six 30 five seven 35 five eight 40 five nine 45
six one 06 six two 12 six three 18 six four 24 six five 30 six six 36 six seven 42 six eight 48 Six Nine 54
Seven One 07 Seven Two 14 Seven Three 21 Seven Four 28 Seven Five 35 Seven Six 42 Seven Seven 49 Seven Eight 56 ??Seven Nine 63
Eight One 08 Eight Two 16 eight three 24 eight four 32 eight five 40 eight six 48 eight seven 56 eight eight 64 eight nine 72
九一09九二18九三27九四36九五45九六54九七63 Jiuba 72 Jiujiu 81
4. Division formula
Yigui (divide by 1): every time one goes into one, every time two goes into two, every time three goes into three, every time four goes into Four, every five goes into five, every six goes into six, every seven goes into seven, every eight goes into eight, 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, two and one add to make five
Three returns (divided by 3): every three goes into one, every six goes into two, every nine goes into three, three, one and three are left. One, three two six and two remaining
Four returns (divided by 4): every four enters one, every eight enters two, four and two are added to make five, four one two leaves two, four three seven leaves two
Five returns (divided by 5): when five is doubled, it is made into one, five times is doubled to make two, five times is doubled to be four, five times is tripled to be six, five or four times is made to eight
Six Return (divided by 6): Add one to every six, add two to every twelve, add six to three to make five, add four to six to one, leave two in six two and three, leave four in six four and six, and leave two in six and five.
Seven returns (divided by 7): every seven makes one, every fourteen makes two, seven adds three to one, seven two adds six, seven, three, four, two, seven, four, five, seven, five, seven. Remaining one, seven six eight and remaining 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, 856 leaves more than two, 867 leaves more than four, 878 leaves more than six
Nine returns (divided by 9): every nine adds one, nine plus one adds one, nine two plus two , add three to nine three, add four to nine four, add five to nine five, nine
Add six to six, add seven to ninety-seven, and add eight to ninety-eight.
Explanation: The division with a single-digit divisor is called "single return"; the division with two or more divisors is called "single return". "return". The first digit of the divisor is called "return", and the following ones are called "division". For example, if the divisor is the division of 534, it is called "five-return, three-four-division", that is, after using the five-return formula to find the quotient, divide by 34.