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2 produkter
How to Calculate Quickly
Full Course in Speed Arithmetic
Häftad, 2000
114 kr
Lägg i varukorg
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.
