The Thorndike Arithmetics, Vol. 2 (Classic Reprint)
Thorndike, Edward Lee![The Thorndike Arithmetics, Vol. 2 (Classic Reprint)](https://support.digitalhusky.com/media/annotations/sorted/218/21886447/CHSBZCOP0321886447.jpg)
Excerpt from The Thorndike Arithmetics, Vol. 2
How much is two thirds of $75 less 10% of itself is how much? And What percent of 40 is 32? These exercises in equation form with missing numbers are harder than routine drills with question and answer, but are more productive of ability, and of ability of a higher type. They also penalize mere memoriter acquisition and serve as an ideally clear, brief, and unrestricted form for mental imagery of...