| A | B |
| Rate | Price; the speed at which or number of times something happens over a period of time; to judge the value of something |
| Reasonable | Fair, logical; having good judgment |
| Reptile | An animal that is cold-blooded, breathes air, and usually has skin covered with scales or bony plates |
| Responsible | Making good decisions; trustworthy |
| Ray | A part of a line that has one end point and goes forever in one direction; a beam of light |
| Rely | To count on something or someone |
| Resident | A person who lives in a particular place |
| Revise | To make corrections or changes to something |
| Radius | The distance from the center of a circle to any point on its curve |
| Recognize | To know and remember upon seeing |
| Republic | A goverment in which the people are free to choose their leaders |
| Review | To study or look at information again |
| Range | The difference between the highest and lowest scores in a data set |
| Region | A specific area with no fixed boundaries |
| Resistant | Works against; Not affected by |
| Right Angle | A 90 degree angle formed by two perpendicular lines |