Clark, William D. Easy math step-by-step: master high-frequency concepts and skills for mathematical proficiency-fast / William D. Clark and Sandra Luna McCune - 2nd ed. - New York: McGraw-Hill Education, c2019. - vii, 294p.; ill. Includes index ISBN: 978-1-260-13521-3 Subjects--Topical Terms: Mathematics Dewey Class. No.: 510 C549 2019