1, and adjacent integers refer to two adjacent numbers divisible by 10. For example, the adjacent integers of 20 are 10, and the adjacent integers of 30,500 are 490 and 5 10. For example, ten and twenty, twenty and thirty are adjacent integers ten.

2. Adjacent number is a mathematical term, which means that in the natural numbers arranged from small to large, two adjacent numbers before and after a number are the adjacent numbers of the number.

3. The numbers from 10 to +∞ (positive infinity) commonly used in life are mostly used for rounding when trading. The number divisible by 10 is an integer of ten.