"A Rapid Calculator" George Milburn, 1928 (No. 801 - Little Blue Book)
 
This is a fascinating guide designed to sharpen mental arithmetic skills through practical techniques and timed exercises. This rare edition explains methods for swift calculation, offering readers strategies to enhance speed and accuracy in everyday numerical challenges, from basic addition to complex multiplication. The work explores the psychological aspects of mental calculation, emphasizing memory retention and concentration as vital components for success.
 
Condition: Upper left corner of cover torn - See photos