Your multiplication formula is not very easy to memorize, so you should strengthen it and know it at the same time; The relationship between dividend, divisor and quotient, division and multiplication. Practice math more. He is different from liberal arts. Read more liberal arts. Science needs more practice. Start with the basics, and then do some extended questions. Believe in yourself and remember to check. This is a good habit.

The second method of solving problems; Personally, I think everyone's talent and IQ are similar, even if math is not as good as others, it doesn't matter much. Without a generalist, stupid birds fly first. I personally have always admired it. This is a clever method. First of all, you have to calculate the number of days in the middle from the month to the month, then divide it by 7, and the rest can be counted down in turn. If it was Monday before and the remainder was 1, it was Tuesday. It's that simple. Of course, you should remember 12 months. Leap years are special. That's it.

I wish you progress in your study.