Direct proportion problems Direct proportion problems can be solved by using the unitary method (finding one): Find the value of one by dividing the total value by the quantity given.

Learn how proportional relationships look on a graph, understand proportionality using worked examples, and for Higher tier, revise algebraic proportion.

Linda C. Fisher, Strategies Used by Secondary Mathematics Teachers to Solve Proportion Problems, Journal for Research in Mathematics Education, Vol. 19, No. 2 (Mar., 1988), pp. 157-168 ...