What does a boy named Jack, a new car, and several available gas stations have to do with estimating (rounding a number)? Discover the easy answer to teaching a sometimes confusing concept. This lesson uses a story and a number line visible to the class (not included) to present the basic rules of estimating in a way that students never forget. This introduction to (or even reteaching of) the concept of estimating is a sure-fire way to make sure your students understand and retain how estimating works and why it is important. The package includes 1) two-pages of step-by-step instructions, including precise teacher/student dialogue, so that even a teacher with no prior experience can present a thorough and effective lesson, 2) the unique story that makes estimating become simple and applicable, 3) illustrations for the story, 4) and a simple individual practice sheet to reinforce the lesson. For one-on-one use with Special Education students, a number line on a desk (with scaled down illustrations) works well.