Multiplying by a fraction is the same as dividing by its reciprocal
1) Multiplying by 1/2 is the same as dividing by 2
2) Multiplying by 1/3 is the same as dividing by 3
3) Multiplying by 1/4 is the same as dividing by 4
4) Multiplying by 1/c is the same as dividing by c