RD Sharma Solutions for Class 7 Chapter 10 “Unitary Method” The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value. This method is used to find the value of a unit from the value of a multiple, hence the value of a multiple. Problems Using Unitary Method, Direct Variations Using Unitary Method, Direct Variations Using Method of Proportion, Inverse Variation Using Unitary Method, Inverse Variation Using Method of Proportion.