Using the Factor Method

Step 1 Determine factorby which to reduce or enlarge the formula.

For example, if a formula is provided for 1000 ml solution, but you wish to make 100 ml solution. The factor in this case would be 0.1. A factor greater than one indicates the formula needs to be enlarged, a factor less than 1 indicates the formula needs to be reduced.

Step 2 Multiply quantity of each ingredient by the factor.