Jane-Jane Lo, Tad Watanabe, Developing Ratio and Proportion Schemes: A Story of a Fifth Grader, Journal for Research in Mathematics Education, Vol. 28, No. 2 (Mar., 1997), pp. 216-236 ...

This project brings together researchers in embodied cognition with researchers and technologists in inclusive design. With the PhET simulation Ratio and Proportion, learners can explore finding and ...

A ratio compares the size of two or more amounts. If the ratio of cats to dogs is 2 : 5, this means for every 2 cats, there are 5 dogs. Equivalent ratios are in the same proportion close ...