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Language: en
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Type: BOOK - Published: 1873 - Publisher:
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Pages: 193
Type: BOOK - Published: 1993-09-01 - Publisher: Taylor Trade Publishing
No author has gone as far as Doerfler in covering methods of mental calculation beyond simple arithmetic. Even if you have no interest in competing with compute
Language: en
Pages: 176
Pages: 176
Type: BOOK - Published: 1858 - Publisher:
Language: en
Pages: 237
Pages: 237
Type: BOOK - Published: 2011-09-01 - Publisher: Souvenir Press
Did you know that it's easier to add and subtract from left to right, rather than the other way round? And that you can be taught to square a three-digit number
Language: en
Pages: 306
Pages: 306
Type: BOOK - Published: 2006-08-08 - Publisher: Crown
These simple math secrets and tricks will forever change how you look at the world of numbers. Secrets of Mental Math will have you thinking like a math genius
