What is the pithy formula of finger rapid calculation in kindergarten?

Step / method addition section 1 increase subtraction method: in an addition formula, if the addend or the addend has a number close to the whole ten, the whole hundred, the whole thousand, etc., they are added by the whole number, and then subtract the difference (that is, the complement), so it is very convenient to calculate

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1. What are the pithy formulas of Chinese pinyin and tone marking
2. Addition and subtraction of rational numbers~ When a > 0, b > 0, then a + B = + (___ +___ ) When a > 0, b > 0
3. 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
4. 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?
5. 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 |
6. Addition and subtraction within 1000 I borrowed 500 from my father, borrowed 500 from my mother, bought a pair of shoes, and used 970. The remaining 30 yuan, returned 10 yuan to my father, returned 10 yuan to my mother, I left 10 yuan, owed 490 yuan to my father, owed 490490 yuan to my mother, 490 yuan + 490 yuan = 980 yuan. Plus my 10 yuan = 990 yuan, where are the other 10 yuan---------------------------
7. What's the simple way to teach children the addition and subtraction method within 20
8. Application of addition and subtraction in grade one mathematics
9. How many addition and subtraction methods do you learn in grade one of primary school?
10. ∫（e,1） (ln x/x)dx=?
11. 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
12. How to teach children finger speed algorithm
13. What is the formula of mental arithmetic?
14. Who can explain the formula of abacus and mental arithmetic to me?
15. The formula of abacus and mental arithmetic
16. 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
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19. What is abacus evolved from and how many years of history is it
20. 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