You have a 4-foot piece of rope and you have to divide it into pieces of 0.25feet long each.
To determine how many pieces of rope he can cut, you have to divide 4 by 0.25
0.25 can be expressed as a fraction as 1/4
So de division is

To divide by a fraction, you have to reverse the fraction and multiply the numerator of the division by the reciprocal fraction


He can cut the rope into 16 pieces of 0.25feet of length each.