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Mathematics in July
If there are five Saturdays in July, then July 1st is Thursday, Friday or Saturday.

The thirty-one days of 135780 are never bad, so there are thirty-one days in July.

Five Saturdays means that four weeks are complete and all have Saturdays. Four times seven equals twenty-eight.

Thirty-one minus twenty-eight equals three. So July 1 day is Thursday, Friday or Saturday.

Knowledge points of mathematics in the third grade of primary school

1, know big month, small month, normal year and leap year;

2. Calculate the number of days in the past;

3. Happy birthday

1, [memory] years are divided into normal years and leap years; Month is divided into big month, small month and special February. There are 365 days in a normal year and 366 days in a leap year. (The big months are: 65438+ 10, March, May, July, August, 65438+ 10, 65438+February (7); Abortion: April, June, September, 165438+ October) (4)

February in a normal year has 28 days and February in a leap year has 29 days.

2. The consecutive months are July and August, or 65438+February and 65438+ 10. The number of days in two consecutive months is 6 1 day, one of which is a big month and the other is a small month.