What are the patterns in the readings of 4th grade math

To master the reading of multiple digits, we must grasp the center of "0":

1. How to read the number within 100 million.

1) No matter how many zeros there are at the end of a number, it is not read. Such as:

2) The "0" at the end of each level is not read. Such as:

3) Other digits have "0", whether there is a "0" or several "0s" in a row, only one "0" is read. Such as:

2. The new situation in the reading of 100 million levels - 10,000 levels are all "0".

Such as: 48500001768

When understanding the number within 100 million, it is impossible to have the situation that "10,000 levels are 0", and the "0" in this case does not belong to the end of a number or the "0" at the end of each level, nor does it belong to the "0" in the middle of each level, which is the only new knowledge in the reading of 100 million series, and there is no need to add it in the textbook, telling students: 10,000 levels are "0", and only one "zero" is read.

3. Summary: Read the rule of zeros.

With the exception of "at the end of a number or at the end of each level", all other digits have a "0" or several "zeros" in a row and only read a zero.

This kind of generalization only needs to remember the end of a number or the 0 at the end of each level, so no matter how many "0s" there are in other digits, only one zero is read, which is easy to understand and remember.

The readings should start from the high position, which is the number of readings. It is easy to read and clear by dividing the scale, and the name of the level is added after reading. There are several zeros in a row in the header, and it is very concise to read only one. Spanning several consecutive 0s, only one is read clearly. If there is a 0 at the end of each level, do not read it and remember it.

1 plus 2 equals 3, 2 plus 3 equals 5, 3 plus 5 equals 8, 5 plus 8 equals 13, 8 plus 13 equals 21, and so on. The thirteenth is an odd number, and it can be seen that out of every 3 numbers, the middle number is even, and 13 divided by 3 equals 4 and 1, so it is an odd number. (If the nth number n is divided by 3, if the remainder is 2, then the nth number is even, otherwise it is odd).

1.Starting with the third number, each number is the sum of the first two numbers, so that the following numbers should be.

2.Starting with the third number, the sequence is in the order of odd-odd-even, so the 13th number is odd.

1,2,3,5,8,13,21，（34），（55），（89），（144），（233）。

The 13th number is an odd number. Because from the 2nd number, every 2 odd numbers will come up with an even number.

1,2,3,5,8,13,21，（34），（55），（89），（144），（233）。The sum of the first two numbers is equal to the third number. Odd number.