How to Calculate Quickly
Many useful procedures explained and taught: 2-column addition, left-to-right subtraction, direct multiplication by numbers greater than 12, mental division of large numbers, more. Also numerous helpful shortcuts. More than 8,000 problems, with solutions.
Auteur | | Henry Sticker |
Taal | | Engels |
Type | | Paperback |
Categorie | | Wetenschap & Natuur |