A.S. Bhatia
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The abacus is basically mechanically aided tool used for counting and forming basic arithmetic; though it is not a calculator it is a kind of calculator, similar to the four function calculators that are used in many elementary school classrooms. Whatever is available for written arithmetic can be solved by abacus.
It is a light weight, easy to operate on and has the following features:
It has a vivid structure, an order of digits, free parallel arrangement of ...
The Modern Dictionary of Astronomy and Space Technology provides definitions of all important terms and expressions used by space scientists and engineers, associated with astronomy and space technology. Placing familiar as well as specialized terms in simple sentences, the dictionary allows readers to grasp aeronautical language within the contexts in which these terms are actually used. Along with definitions and example sentences, the illustrations are also ...
This book differs from an ordinary text book. It contains exceptional study material for those entering colleges, vocational schools etc., which can also be useful at school level, and the knowledge of it in many competitive exams. The material in part I is presented in a new form. It contains speed calculations by various methods. The methods described will provide the reader faster and easier ways to add, subtract, multiply, divide and take square roots etc. ...