Addition is one of the four basic operations, which refers to the calculation of combining two or more numbers and quantities into one number and quantity. The symbol of addition is the plus sign "+". Connect items with a plus sign when adding.

The importance of elementary school arithmetic;

One of the characteristics of excellent children is their excellent computing ability. Therefore, when the National People's Congress selects and inspects students, it also focuses on calculation, because neither hands-on ability, logical thinking ability nor spatial imagination ability can be inspected in a short time, and only calculation can be inspected immediately.

Take the senior high school entrance examination as an example. The calculation steps of the senior high school entrance examination paper are about 600~800 steps, so we conservatively estimate that if each step is 2 seconds faster, the overall speed will be 20 minutes faster, but these 20 minutes are enough to change many things.