Mathemagic [1992 ed] 0716601915

Citation preview

athemagic I

Childcraft

THE

HOW

AND

WHY

LIBRARY

1992

Edition

Childcraft— The (Reg.

US

Pal

How and Why

Library

Off.)

ic 1991 World Book, Inc. All rights reserved This volume may not be reproduced in whole or m part

in

any

form without prior written permission from the publisher.

World Book,

Inc.

525 West Monroe Chicago. Si

IL

60661

1990, 1989, 1987, 1986, 1985 by World Book.

1980, 1979

USA

Inc. f

1982, 1981,

by World Book-Childcratt International, Inc {

1976, 1974. 1973, 1971. 1970, 1969, 1968, 1965. 1964

USA.

by

Field Enterprises Educational Corporation

International Copyright

?

1987. 1986. 1985 by World Book,

International Copyright

c,

1982, 1981, 1980,

1

Inc.

979 by World Book-

Childcraft International, Inc. International Copyright 5 1976, 1974. 1973. 1971. 1970, 1969, 1968,

1965, 1964 by Field Enterprises Educational Corporation.

ISBN 0-7166-0191-5 Library of Congress Catalog Card Number 90-701 78 Pnnted

m

the United States of America

A/IB

Acknowledgments The publishers

The How and Why acknowledge the courtesy of

of Childcraft—

Library gratefully

the following publishers, agencies, authors, and

organizations for permission to use copyrighted stones, poems, and illustrations

in this

volume

acknowledgments appear on

Full Illustration

page 282.

National Council of Teachers of Mathematics:

"The Roads

of

Math" by Jeffrey

Dielle. reprinted

from the Arithmetic Teacher. October 1966 13. p. 467),

1966 by the National Council

c

(vol

of

Teachers of Mathematics, used by permission Photograph of Stonehenge. page 254.

Georg