How to Calculate Quickly: Full Course in Speed Arithmetic by Henry Sticker
Publ: Dover Publications | 1955 | DJVU (rar) | 6.6 MB | English | ISBN-10 : 048620295X
Publ: Dover Publications | 1955 | DJVU (rar) | 6.6 MB | English | ISBN-10 : 048620295X
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.
I gave it a five star simply because the books is simple and very effective at getting you to learn the "art" of quick calculation.
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