There were six hundred students to a football match the beginning of the match there one thousand students

Huh???

Sounds like a boring football game.

To find out how many students arrived after the beginning of the football match, we can subtract the initial number of students from the final number of students.

Final number of students = 1000
Initial number of students = 600

To calculate the number of students who arrived after the beginning of the match, we can subtract the initial number of students from the final number of students:

Number of students who arrived after the beginning = Final number of students - Initial number of students
Number of students who arrived after the beginning = 1000 - 600
Number of students who arrived after the beginning = 400

Therefore, after the beginning of the match, 400 students arrived.