The formula of abacus and mental arithmetic

1、 The formula of addition is not carry add carry add straight add full five add into ten break five into ten add one up one down five go four one go nine go one two up two two down five go three two go eight go one three up three down five go two three go seven go one four up four down five go one four go six go one five up

RELATED INFORMATIONS

1. Who can explain the formula of abacus and mental arithmetic to me?
2. What is the formula of mental arithmetic?
3. How to teach children finger speed algorithm
4. The magic cross formula and the following formula Before my friends taught me to play for several years, but I forgot the pithy formula. I remember the cross pithy formula. It seems to be up left down left up left down, but I can't turn the cross. After the cross turns better, I need to use the pithy formula for color and color. Finally, I need to use the comprehensive pithy formula for lecherous. Please give me some advice! Don't come to me like lur. I can't understand the video. Please answer carefully
5. What is the pithy formula of finger rapid calculation in kindergarten?
6. What are the pithy formulas of Chinese pinyin and tone marking
7. Addition and subtraction of rational numbers~ When a > 0, b > 0, then a + B = + (___ +___ ) When a > 0, b > 0
8. Give me 10 ways of rational number addition and subtraction Give me 10 elementary one's rational number addition and subtraction method, 10 one variable linear equation It needs to be square
9. The addition and subtraction of rational numbers in the first day of junior high school Xiao Ming plans to do five math problems every day during the holiday. If he has more than one problem, he will write a positive number. If he has less than one problem, he will write a negative number. The number of problems in ten days is recorded as follows: 3.5, - 4.2, - 1.7,0, - 3.8,10. Q: how many math problems did Xiao Ming do in ten days?
10. The addition and subtraction of rational numbers in the first day of junior high school! 1. The value of a + B-C is equal to that of a + b-c A.a-(-b)-(-c) B.a-(-b)-(+c) C.a+(-b)-c D.a+(c-b) 2. Seek | 1 / 10-1 / 11 | + | 1 / 11-1 / 12 | + | 1 / 12-1 / 13 | + +|The value of 1 / 49 + 1 / 50 |
11. The latest formula of abacus and mental arithmetic in kindergarten My son is in preschool. He has set up abacus and mental arithmetic in the class, but the formula taught by the teacher is different from what we used to learn. For example, the formula of 4 + 3 is "three is not enough for seven, slide" and so on. We need this formula of abacus and mental arithmetic
12. Nine pearl mental arithmetic formula
13. Tianjin abacus level 5 calculator can be used? Zero basis can be passed?
14. What is abacus evolved from and how many years of history is it
15. Material is that abacus, Baidu can take a look Material 2 is that after five years of efforts, Chinese abacus project has been listed in the list of human intangible cultural assets of UNESCO. (1) combined with material 1, using the knowledge of cultural heritage, this paper analyzes the Enlightenment from the development of Chinese abacus (2) From From the perspective of cultural assets, talk about your understanding of China's abacus application for world heritage
16. How to play the multiplication and division method of abacus? Don't give me a pithy formula. It's better to give an example of how to calculate 25x25. If it's three digit
17. Are the edges of parallelogram ABCD ad = 2Ab, AE = BF = AB, EC intersecting ad at m, FD intersecting BC at n, and quadrilateral CDMN diamond? Explain the reason emergency
18. Given four points a (- 1,3), B (1,1), C (4,4) d (3,5), this paper proves that the quadrilateral ABCD is a trapezoid, using sine and cosine theorem~
19. Given four points a (1,0) B (4,3) C (2,4) d (0,2) on the rectangular coordinate plane, this paper proves that the quadrilateral ABCD is isosceles trapezoid
20. In the international system of units, the basic unit of mechanical quantity is (). The unit of force is (), which is derived from the formula () There is no need to answer the unit of force