It is not the most difficult problem to practice math for 53 days every day in senior one. "53-day exercise" is a kind of math problem, which is mainly to let students master basic math calculation and application ability. Although this type of question is not difficult, it still needs to spend a lot of time and energy to practice and consolidate repeatedly in the learning process. At the same time, this type of question is also the basis of other more complicated mathematical operations and one of the basic skills that must be mastered.