Excuse me, do you want to ask "how to draw a calendar with four 45-degree angles and the number 5 in the math book"? Calendar drawing method is as follows:

1. Draw a square with 7 columns and 6 rows on a piece of paper with a pencil, and fill in the day of the week in the first row.

2. Fill in the date in the first column from 1 to 3 1.

3. Draw a small circle below the date to be marked and mark it with the number "5" until each line has a date marked with the number "5".

Draw a 45-degree diagonal line in the upper left corner and lower right corner of each square with a ruler and pencil, so that you can get two 45-degree angles.

5. Draw another 45-degree diagonal line between the upper right corner and the lower left corner of each square with a ruler and pencil, so as to get the other two 45-degree angles.

6. Draw the outline and text of the whole calendar with black ink pen or pen-and-ink drawing.

7. You can use colored pens or pencils to add some colors and decorations to the calendar to complete the work.