GCSE Maths Ratio, proportion and rates of change learning resources for adults, children, parents and teachers.

Journal for Research in Mathematics Education, Vol. 19, No. 2 (Mar., 1988), pp. 157-168 (12 pages) Twenty secondary mathematics teachers described their thinking as they solved four proportion ...

Margaret Rathouz, Nesrin Cengiz, Angela Krebs, Rheta N. Rubenstein, Tasks to Develop Language for Ratio Relationships, Mathematics Teaching in the Middle School, Vol. 20, No. 1 (August 2014), pp.