This book contains tricks that break down seemingly complicated operations, such as the equation ABCD*9999 = ABC(D—1)(9—A)(9—B)(9—C)(10—D). Although it's valuab

This book contains tricks that break down seemingly complicated operations, such as the equation ABCD*9999 = ABC(D—1)(9—A)(9—B)(9—C)(10—D). Although it's valuable to understand the logic behind these tricks, they could also help students who struggle with math in school.