Guess the rules of the game of math anagrams, how to solve the number puzzles

Here's how to solve the problem:

1. Single-digit analysis.

As the name suggests, according to the number on the single digit as a breakthrough, fill in the number that can be determined first. Of course, no matter where we find a breakthrough, we always fill in the numbers that can be determined first. This lays a solid foundation for our later reasoning and can reduce the amount of computation by a lot.

2. Carry analysis method.

Since there is a possibility of carrying in addition and multiplication calculations, this will also increase the difficulty of solving the problem. However, through carry analysis, some favorable conditions for solving problems can often be obtained.

The number puzzle of adding and subtracting two integers is relatively simple, and its main consideration is carry and borrow. If two numbers are added, it will be carried up to 1 for each digit, which is an implicit condition. Let's think about adding two numbers, at most 9 plus 9 equals 18, and you can only go into 1, right?

This is a very good breakthrough. The multiplication number puzzle is slightly more complicated, and there are many possibilities for the carry of multiplication, which requires us to combine multi-step calculations to eliminate.

3. Borrowing analysis.

This one is generally found in subtractive number puzzles. For example, subtract a three-digit number to get a one-digit number. Obviously, there is a borrowing in this calculation process.

And there is a fixed solution to this kind of problem, which is ** triangle. The number in the hundredth digit of the three digits is 1, the number in the tenth digit is 0, and the ten digit in the subtraction must be 9.

Since addition and subtraction can be converted to each other, if a single digit is added to a two-digit number to get a three-digit number, there is also a ** triangle. Why is there such a rule? The derivation process is not difficult, and you can deduce it yourself.

4. Digital analysis, which is often combined with estimation.

5. Highest bit analysis. That is, the analysis starts with the highest digit. Again, this requires estimation.

6. Estimation. I remember that some netizens said in the past that mathematics is a rigorous subject, and it is clear that there are specific numbers there, which can get accurate values, so what is the use of estimating? Isn't it a snake to add to it?

Estimation is certainly not an exact calculation, but it is equally powerful. For example, when we do some relatively large calculations and do not need very precise values, we can use estimates, of course, there is a range of estimates, and if the deviation is too large, it will not make much sense.

When it comes to number puzzles, estimation can be said to be a tool throughout.

For example, if a four-digit number is multiplied by 6, the product obtained is still a four-digit number, can we estimate that the highest digit must be 1 immediately?

The highest digit cannot be 0, if it is 2, at this time 2 times 6 has been exceeded, there must be more digits because of the carry, so there is only 1 This is the only possibility.

Flexible use combined with parity. Being good at using parity can directly cut the likelihood of categorical discussion in half. Parity is a knowledge point in the number theory part.

236. Guess the word puzzle: divide the number vertically, multiply the number horizontally, add the number to life, and the minus sign to end. Guess a word. The answer is (blame).

237. Charade: Rolling Qiao is not like a horse, like a cow. It's a horse, not a cow. Guess a big slide key word. Answer (noon).

238. Charade: three horizontal roads, one vertical road, three people, race run. Guess a word. Answer (path).

239, guess the word puzzle to make socks: Gumi closes, and leaves before painting. Rabbit head dew, walk after painting. Guess a word. Answer (fish).

240. Charade: to the sun, than the moon. Guess a Chinese two-character place name. Answer (Kunming).

241. Charade: two slices of meat, worn with a vertical stick. In the entrance, in the back. Guess a word. Answer (string).

242. Guess the word puzzle: high oblique up, square down. A nun, a monk. Guess a word. Answer (Temple).

243, guess the word puzzle: lunar moon, sunny moon. It's the first month again, and it's October. Guess a word. Answer (limb).

244, charade: two people, ripping skin. That means, listen is than. Guess a word. Answer: (Petro).

245, guess the word puzzle: a radish, round and slippery, pull it out, give it to a friend. Guess a word. Answer (pull).

246, guess the word puzzle: Bull Demon King, Lidao Liang, Tang Seng hides, Chang'e hides. Guess a word. Answer (system).

247. Charade: Go forward and take a bite. Walk diagonally and take two bites. Guess a word. The answer (forced).

248, guess the word puzzle: cloth under the cloth, no dots. Cloth after cloth, dot on point. Guess a word. Answer (post).

249, charade: at dusk, a total of doubles. After dreaming, I got Tiangang. Guess a word. Answer (Luo).

250. Guess the word puzzle: just like three, not three, just like water, like water. Guess a word. Answer (juice).

251. Charade: The stone bed is long, and it is placed in front of the village. Wheat becomes flour, beans turn into pulp. Guess a word. Answer (grinding).

252, guess the word puzzle: eleven o'clock, travel day, one person accompany, say "yes". Guess a word. Answer (waiting).

253. Guess the word puzzle: a house, a command, a blanket, a pen. Guess a word. Answer (Mao, seven).

254. Charade: one person left, one person right. Face to face, hands behind your back. Guess a word. Answer (servant).

255. Guess the word puzzle: When the water comes, it is general. and if you are weary, you will leave it behind. Guess a word. The answer is (lack).

256. Charade: Say that there are 100 million, say that there is art, say that there is righteousness, and say that there is intention. Guess a word. Answer (yes).

257. Charade: Before school starts, take a fish hook. After school, I pricked my hand. Guess a word. Answer (hole).