Comparison, that is, the size of two numbers; Calculation is a simple addition and subtraction calculation problem. These are basic questions.

Knowing numbers is the first step for children to learn mathematics. Numbers do not exist naturally, but are counting symbols invented by human beings for the convenience of counting. But later, numbers were not only used for counting, but also given more meaning by human beings. Using numbers to represent the number of objects is the original meaning after the birth of numbers, so the first lesson of senior one mathematics is to know numbers from specific numbers in life. For example, count the number of street lamps and trees in life.