32 simple tricks for quick mental calculations
Yakov Perelman$9.31
$10.95
This short book is a collection of simple and easily grasped tricks to speed up your mental arithmetic. If you want to master them you should realize that to be used fully they need to be approached conscientiously, not mechanically. But it pays to master them as they will enable you to do calculations in your head without error, as with written calculations.
Binding Type: Paperback
Publisher: Prodinnova
Published: 01/26/2019
ISBN: 9782917260982
Pages: 18
Weight: 0.09lbs
Size: 9.00h x 6.00w x 0.04d