1. When two objects correspond to each other one by one and there is no surplus, the two objects are said to have the same number.
2. When two kinds of objects are in one-to-one correspondence, one of them has surplus, there are many surplus objects, and there are few surplus objects.
3. When comparing two more or less objects, you can use the one-to-one correspondence method.
Extended data:
1, Count: when counting, count in a certain order, from 1 to the number corresponding to the last object, that is, the last count, which is the total number of such objects.
2. Understanding up and down: Understanding the meaning of up and down, from the position of two objects: up refers to the high object, and down refers to the low object.
3. Know before and after: Understand the meaning of before and after. Generally speaking, the facing direction is front and the facing direction is back. The same object will also change its positional relationship relative to different reference objects. From this, it is concluded that when determining the front-back position relationship of more than two objects, it is necessary to find the correct reference object, and the relative front-back position relationship will also change with different reference objects.
4. Know the left and right: determine the left and right according to the position of your left and right hands. The side where the right hand is located is the right, and the side where the left hand is located is the left.
5. Specific size: the number in front is equal to the number in the back, which is represented by "=", that is, 3=3, which is read as 3 equals 3; The former number is greater than the latter number, which is represented by ">", that is, 3 > 2, which is pronounced as 3 greater than 2; The first number is less than the last number, which is indicated by ""or "".
6. Numeric sequence of numbers 1-5: from front to back: 1, 2, 3, 4, 5. From the back to the front: 5, 4, 3, 2, 1.
7. Sequence within 1 0: from beginning to end: 0,1,2, 3, 4, 5, 6, 7, 8, 9, 10. From back to front: 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0.