1, serial number: to find a regular topic, a series of quantities arranged in a certain order are usually given, and we are required to find a general rule according to these known quantities. Find out the rule, usually the serial number of the package. Therefore, it is easier to find the mystery by comparing variables with serial numbers.

2. Fibonacci sequence method: each number is the sum of the first two numbers.

3. Arithmetic series method: the difference between every two numbers is equal.

4. Tabbing method: You can look at it every once in a while to see what the relationship between the separated numbers is, for example, 14, 1, 12, 3, 10, 5, odd items become arithmetic progression, even items also become arithmetic progression, and then you have to fill in 8.

Find a routine method:

Find patterns and fill in numbers, or find patterns by figures. At first, everyone found patterns through some comparisons. Maybe some series of three numbers have a "pattern", but it is not certain, it can only be regarded as a guess. Generally, it needs more than three, including the combination of before and after control to confirm the law.

Whether looking for laws in sequence or in graphics, we need keen observation. In particular, some laws are deeply hidden and need to be bold and cautious to discover. Finally, after filling it out, it is necessary to check whether the rules found before and after are correct, so that it will not be in vain.