How to Calculate Quickly
The Art of CalculationPaperback - 1955
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. 1945 edition.
Publisher: Mineola, N.Y. : Dover Publications, c1955.
Characteristics: vi, 185 p. ; 21 cm.
Alternative Title: How to calculate quickly : full course in speed arithmetic