Formula table for old fashioned abacus, formula table for abacus

The formula table for the old-fashioned abacus is as follows:

1.When it is full of five pounds, it is ten hangings.

2.Two hundred and fifty one.

3.Four-five-one-ten.

4.One goes nine into one.

5.Two goes to eight into one.

6.Three to seven to one.

7.Four to six to one.

8.Five to five into one.

9.Six to ** one.

10.Seven goes to three into one.

11.Eight goes to two into one.

12.Nine goes to one into one.

13.Nine one goes nine.

14.Nine goes to nine.

15.Ninety-two, one to eight.

16.Ninety-two goes to eight.

17.Ninety-three goes to seven.

18.Ninety-three, the next goes to seven.

19.Ninety-four goes to six.

20.Ninety-four goes to six.

21.Ninety-five, one-on-five, five-on-five.

22.Ninety-five goes to five.

23.Ninety-six, one to four.

24.Ninety-six, the next goes to four.

25.Ninety-seven goes to three.

26.Ninety-seven goes to three.

27.Ninety-eight one to two.

28.Ninety-eight goes to two.

29.Ninety-nine goes one to one.

30.Ninety-nine goes one.

The above is the formula table of the old-fashioned abacus, you can view and use it according to the actual situation.

The non-carry is added to the carry position, the straight is added to the full five, and the ten is added to break the five into ten.

Add one, one up, five to four, one to nine. Add two, two on two, two down five to three, two to eight into one. Add three, three on three, three down five to two, three to seven into one.

Add four, four on four, four down five to one, four to six into one. Add five, five on five, five go five into one. Add six, six on six, six to **one, six on one to five into one.

Abacus. It is a form of manual operation calculation aid. It originated in China and has a history of more than 2,600 years and is an important invention in ancient China. In Arabic numerals.

Before its appearance, the abacus was a widely used calculation tool in the world. The formulas of abacus include addition formula, subtraction formula, and multiplication formula.

Division formula.

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The formula table of the abacus is as follows: one, two, three, four, up and down pentacimal; Five, six, seven, eight, Zuo He missed one place; Nine, ten, move one place to the right. This formula table is used to help memorize the carry and abdication rules on the abacus.

Where one to four represent the numbers in each column, five to eight represent the numbers in each row, and nine and ten represent carry and abdicate. For example, when the number of punching dates on one column is added to the number on another column, if the result is greater than or equal to five, it needs to be carried up to the next column; If the result is less than five, there is no need to carry it. When the number on one column subtracts the number on another column, if the result is less than zero, you need to abdicate the previous column; If the result is greater than or equal to zero, there is no need to abdicate.

This formula sheet can be disassembled to help us quickly and accurately use the abacus for calculations.