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Fifth grade, book two, first math.
During the summer vacation, Zhang Ming and Fang Hua went to the Children's Palace to study. July 10, Zhang Ming and Fang Hua are both going for the first time. After that, Zhang Ming went every 1 day, and Fang Hua went every four days.

(1). Circle the date when Zhang Ming went to study in July on the calendar. These dates are multiples of (2), namely (10, 12, 14, 16, 18, 20, 22.

(2) Draw a horizontal line below the date when Fang Hua went to study. These dates are multiples of (5), namely (10, 15, 20, 25, 30).

(3) The date is (10,20,30), which is the common multiple of (2) and (5). At that time, both of them were in the Children's Palace.

(4) If they still study like this in August, it is inferred that the next study day is August (9). 9. What's the topic? I don't have a book. 2. You'd better post the title or no one will answer. 1 is a multiple of 2,0! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! 0, People's Education Press Primary School Grade Five Volume II Mathematics Synchronization Page 42 Question 2

During the summer vacation, Zhang Ming and Fang Hua went to the Children's Palace to study. July 10, Zhang Ming and Fang Hua are both going for the first time. After that, Zhang Ming went every 1 day, and Fang Hua went every four days.

(1). Circle the date when Zhang Ming went to study in July on the calendar. These dates are multiples of (), respectively ().

(2) Draw a horizontal line below the date when Fang Hua went to study. These dates are multiples of (), that is, ().

(3) The date is the common multiple of () and (). At that time, both of them were in the Children's Palace.

(4) If they still study like this in August, then the next study day is August ().