There were 370 students in Grade Two in 2009, all of whom were seven years old. At least some of them were born on the same day in the same month.

Solution:

July 2009 = 2002, these children were born in 2002, 365 days a year, 370/365 = 1...5, so at least two people will be born on the same day in the same month, if they are in the same month, 370/12 = 30 ...

Multiplication:

(1) How much is a few.

(2) How many times is a number?

③ Find the area and volume of the object.

(4) Find the fraction or percentage of a number.

Department:

① Divide a number into several parts on average and find out one of them.

② Find out how many other numbers are in a number.

(3) Given a fraction or percentage of a number, find this number.

(4) Find a number that is several times that of another number.