Secrets of Mental Math
The Mathemagician's Guide to Lightning Calculation and Amazing Math TricksBook - 2006 | First edition.
Did you know it's easier to add and subtract from left to right, rather than the other way around? That it's possible to square a three-digit number in mere seconds? Regardless of their skill level, with this book, anyone can mentally calculate complex problems with amazing ease.
Publisher: New York : Three Rivers Press, 
Edition: First edition.
Copyright Date: ©2006
Branch Call Number: 510 BEN
Characteristics: xxii, 278 pages :,illustrations ;,20 cm