It is the mathematics content of the third grade of primary school, and the addition and subtraction within 10 thousand. Calculated in ten thousand units, it is two thousand +65438+ ten thousand equals 65438+ two thousand. Be sure to read the figures clearly when calculating, and don't be careless.

The symbol of addition is the plus sign "+". Connect items with a plus sign when adding.

relevant information

Addition has several important properties. It is interchangeable, which means that the order is not important, it is interrelated, which means that when more than two numbers are added, the order in which the addition is performed is not important. Repeatedly adding 1 is the same as counting; Adding 0 will not change the result. Addition also follows related operations such as subtraction and multiplication.

Addition is one of the simplest digital tasks. The most basic addition: 1+ 1 five-month-old babies and even other animal species can be counted. In primary education, students are taught to calculate the superposition of decimal numbers, starting with one digit, and gradually solving the more difficult number calculation.