There are 28 students in sharons class one fourth of the students were absent on monday how many students were present on monday

There are 21 students present on Monday. 

This is just a simple Math. You only need to get the number of students absent since the needed data is given. Then subtract the result from 28, then you'll get 21. 

I'll show you. 

Problem: How many students were present on Monday?
Given: 28 total number of students; 1/4 of the students were absent 
Solution: 

  >> 1/4x28 or 0.25x28 = 7 <--- number of students absent 
 >>  28-7= 21 <--- number of students present 
   

In the statement above, there are 1/4 of 28 student sof Sharons Class were absent. You will just need to multiply 1/4 to 28 in order to get the number of absents. 
Solution:
1/4 x 28 = 7
There were 7 students who were absent..
To find the number of present, you will just subtract it from the total number of students which is 28.

28-7=21 students were present. 

Just find a long word in the book.