If there are 200 students in 7 grade and 60% of them walk.
To find the number of them that walk, simply find 60% of 200
That is;
Number of grade 7 student that walk = 60% of 200
=60/100 x200
= 60 x2
=120
Hence 120 students in grade 7 walk to school
OR
Number of grade 7 student that walk = 60% of 200
=60/100 x200
=12 000 /100
=120
Hence 120 students in grade 7 walk to school