How to calculate quickly: full course in speed arithmetic
Auteur :
Sticker, Henry
Éditeur :
Dover Publications Inc.
ISBN :
9780486202952
Date de publication :
1 févr. 2000
Dimensions :
20,4 x 13,8 x 1,0 cm
Poids :
235 g
Langue :
Anglais
Pays d'origine :
USA
Many useful procedures explained and taught: 2-column addition, left-to-right subtraction, mental division of large numbers, more. Also numerous helpful shortcuts. More than 8,000 problems, with solutions. 1945 edition.