The Trachtenberg Speed System Of Basic Mathematics
Jakow Trachtenberg, Ann Cutler, Rudolph McShane
The complete system of the Trachtenberg method of mathematics which makes possible high-speed arithmetical calculations with a remarkable degree of accuracy. This method is not only speedy but simple. Once one has mastered the rules, lightning calculation is as easy as reading a story. It looks like magic, but the rules are based on sound logic.
Категорії:
Рік:
1999
Видання:
New edition
Видавництво:
Souvenir
Мова:
english
Сторінки:
269
ISBN 10:
0313232008
ISBN 13:
9780285629165
Файл:
DJVU, 1.38 MB
IPFS:
,
english, 1999