Sticker H. — How to calculate quickly: Full course in speed arithmetic
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Название: How to calculate quickly: Full course in speed arithmetic
Автор: Sticker H.
Аннотация:
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.
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О проекте