Respuesta :
It helps to find a common denominator. 8 would be a good one for this problem. You just change the form of each fraction and subtract.
6/8 - 4/8 = 2/8
His friend ate 2/8 (or 1/4) of his popcorn.
6/8 - 4/8 = 2/8
His friend ate 2/8 (or 1/4) of his popcorn.