How To Calculate Quickly: Full Course in Speed Arithmetic - Brossura

Brossura

ISBN 10: 048620295X ISBN 13: 9780486202952

Casa editrice: Dover Publications, 2025

Riassunto

Molte procedure utili spiegate e insegnate: addizione su 2 colonne, sottrazione da sinistra a destra, moltiplicazione diretta per numeri maggiori di 12, divisione mentale di numeri grandi, e altro ancora. Anche numerose scorciatoie utili. Oltre 8.000 problemi, con soluzioni. Edizione del 1945.

Su questo libro

Dalla quarta di copertina

Do you want to double or triple the speed with which you calculate? How to Calculate Quickly is a tried and true method for helping you in the mathematics of daily life—addition, subtraction, multiplication, division, and fractions.
The author can awaken for you a faculty which is surprisingly dormant in accountants, engineers, scientists, businesspeople, and others who work with figures. This is "number sense"—or the ability to recognize relations between numbers considered as whole quantities. Lack of this number sense makes it entirely possible for a scientist to be proficient in higher mathematics, but to bog down in the arithmetic of everyday life.
This book teaches the necessary mathematical techniques that schools neglect to teach: Horizontal addition, left to right multiplication and division, etc. You will learn a method of multiplication so rapid that you'll be able to do products in not much more time than it would take to write the problem down on paper.

This is not a collection of tricks that work in only a very few special cases, but a serious, capably planned course of basic mathematics for self-instruction. It contains over 9,000 short problems and their solutions for you to work during spare moments. Five or ten minutes spent daily on this book will, within ten weeks, give you a number sense that will double or triple your calculation speed.

Dettagli dell'edizione

• Editore: Dover Publications
• Data di pubblicazione: 2025
• Lingua: Inglese
• ISBN 10: 048620295X
• ISBN 13: 9780486202952
• Rilegatura: Copertina flessibile
• Numero di pagine: 192
• Contatto del produttore: Dover; info@galileo-mc.de; ; Dachauer Str. 5-7; F�rstenfeldbruck; 82256; Germania