There is no need to increase at the same time, because when calculating the age problem, the age increase of two people is the same, and the calculation is different for several years, and it is the same whether it is added or not.

This is an intelligence math test to examine the relationship between students' reaction and real life. Primary school mathematics is to teach children a series of knowledge about number, four operations, the calculation formula of figure and length, unit conversion and so on through textbooks, which lays a good mathematical foundation for junior high school and daily life calculation.