1 1 and 8 are integers. Integer is a basic concept in mathematics, including positive integer, negative integer and zero. Here 1 1 and 8 are positive integers. We can think of them as numbers in any situation, such as 1 1 apple or 8 oranges.

Then, let's discuss the number 19. In the formula 1 1+8= 19, 19 is the result of addition and is called sum. This is an important concept in mathematical operation, which represents the process of combining two or more lead heads into a sum. In real life, we can imagine 19 as a scene with 19 apples or oranges in total.

We can also look at these numbers from a more abstract point of view. For example, 1 1 and 8 can be regarded as operands in mathematical operations, and the plus sign "+"represents the operation "addition". Similarly, 19 is the result of this operation and can also be regarded as an operand.

Notes on Wang You's Thoughts Needed by Mathematical Addition;

1. Understand the meaning of addition: Addition is one of the most basic operations in mathematics, which means combining two or more arrays into a sum. Understanding the meaning of addition is very important for learning other mathematical concepts and skills.

2. Operation sequence: When adding, the correct operation sequence must be followed. First, the numbers should be added up from left to right. If there are brackets in the middle, count the numbers in brackets first.

3. Carry problem: When the sum of two numbers exceeds 10, carry problem should be considered. At this point, you need to add the carry flag to the next number and add the decimal number to the value of that number.

4. Integer and decimal: Pay attention to the difference between integer and decimal when adding. For decimals, special attention should be paid to the position of decimal point to ensure the correct number of decimal places.

5. Special circumstances: some special circumstances need attention, such as 0+ arbitrary number = arbitrary number, 0+0 = 0; Any number +0= any number. In addition, any number +0= any number.

6. Error checking: After adding, error checking should be performed. By recalculating or checking the carry flag, errors can be found and corrected.

7. Writing standard: When writing the addition formula, you should follow the standard writing format. Numbers and operators should be arranged in the correct order, and should be aligned correctly for easy reading.

8. Addition in application problems: When solving application problems, it is usually necessary to use addition to calculate the sum or sum. At this point, you should read the question carefully and understand the meaning of the question, then gradually calculate the value of each quantity and finally get the answer.