A BOOKLET DESIGNED FOR ELEMENTARY SCHOOL STUDENTS TO BE USED INDEPENDENTLY FROM AND IN ADDITION TO THE REGULAR CLASSROOM CURRICULUM IN MATHEMATICS IS PRESENTED. THE PURPOSE IS TO TEACH THE FIFTH- OR SIXTH-GRADE STUDENT TO USE GOOD JUDGMENT AND REASONING IN LOCATING THE DECIMAL POINT. A DISCUSSION OF THE PURPOSE AND IMPORTANCE OF BEING ABLE, QUICKLY AND ACCURATELY, TO ESTIMATE VALUES INTRODUCES THE STUDENT TO THE TOPIC. SAMPLE PROBLEMS, ANSWERS, AND EXAMPLES ARE PRESENTED. AN EXAMPLE OF THE MENTAL METHOD USED IN THIS BOOKLET IS--".24 IS ALMOST 1/4. ONE-FOURTH X 4.1 IS ABOUT 1, .948 IS ABOUT 1. THE POINT IS PLACED CORRECTLY." THE TEACHER SHOULD IDENTIFY POTENTIAL USERS, ORIENT THEM TO THE AREA TO BE EXPLORED, AND STIMULATE AND MAINTAIN THEIR INTEREST IN SUSTAINED INDEPENDENT EFFORT.