Poskitt, Kjartan. Everyday math tricks for grown-ups : shortcuts and simple solutions for the not-so-math minded / Kjartan Poskitt. - New York : Readers Digest, c2011. - 175 p. : ill. ; 20 cm. ISBN: 9781606523292 (pbk.) 1606523295 (pbk.) LCCN: 2011010321 Subjects--Topical Terms: Mathematics. LC Class. No.: QA93 / .P674 2011 Dewey Class. No.: 510