Convert 1/4 into 8ths. To do this, multiply the top and bottom by 2. 1/4 = 2/8. Now you add the piece Rachel ate to get 3/8. You want to know how much is left so subtract 3/8 from 8/8. 8-3=5. There are 5/8 of the pizza left.
we want to find it in eighths convert to eitghts 1/4 times 2/2=2/8 at first there are 8/8 pizza then 1/8 is eaten then 2/8 is eaten 8/8-1/8-2/8=7/8-2/8=5/8 5 eighths of the pizza are left