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230643

О'Рурк

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0,4 kg

Germany
 balta
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O'Rourke's multiplication tables contain the products of two- and three-digit numbers (11-999) and two-digit numbers (1-99).
The tables consist of 989 separate tables, above each of which one of the factors (11-999) is placed. The second factor (1-99) is decomposed into two terms: tens and ones. Numbers of tens are in the upper horizontal line, units - in the extreme columns. In the table corresponding to one of the factors, in the column under the number of tens of the second factor, in the line against the number of its units is the product.
In this edition, the tables, starting with three-digit multipliers, are supplemented (from above) with a line of products by hundreds of factors.
Additional lines of finished products for hundreds of multipliers eliminate the need to determine the digits when adding partial products and thus preserve automatism when using tables for multiplying three-digit factors.
In view of the fact that the main tables have not been structurally changed, the publisher considers it possible not to change the names and to keep O'Rourke's authorship behind the tables.

Data sheet

Publisher Статистика
Publication date 1965
Number of Pages 336
Bookbinding твердый

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