Quote:
How to Calculate Quickly - Full Course in Speed Arithmetic
Publisher: Dover Publications
Henry Sticker
1955
Language: English
ISBN-10: 048620295X
ISBN-13: 978-0486202952
192 pages
PDF
5.09 MB
Many useful procedures explained and taught: two-column addition, left-to-right subtraction, direct multiplication by numbers greater than 12, mental division of large numbers, more. Also numerous helpful short cuts. More than 8,000 problems, with solutions.


