00760cam a2200241 a 4500 0471387940 (pbk.) MAIN QA135.5 HED Heddens, James W. Today's mathematics Part 1: concepts and classroom methods / James W. Heddens [and] William R.Speer. 10th ed. New York : John Wiley, 2001. xii, 381 p : ill. ; 28 cm. Includes bibliographical references. Mathematics Study and teaching (Elementary) Speer, William R. .b10343684 15-10-14 25-06-14 20230120144454.0 NUST BOOKS QA135.5 HED 97468 97468