Pages from an old math textbook...

The book is Hamilton's Essentials of Arithmetic -- Higher Grades, by Samuel Hamilton, PhD, LLD, Superintendent of Schools, Allegheny County, Pennsylvania. Published by American Book Company (New York, Cincinnati, Chicago, Boston, Atlanta), 1919 and 1920.

From the Preface:

"The two important ends sought in the teaching of arithmetic are (1) to give the pupil a mastery of number combinations and processes as will enable him to perform with accuracy and speed all common numerical operations; and (2) to train him in the skillful application of these processes to the problems that he is likely to meet in his daily experiences."

Dad wrote in the front: Henry W. Sander Central School Grade 7, Section 4 Fort Lauderdale, Fla.
Also, Henry Walker Sander Central School Grade 7

Grade 7 probably occurred when he was about 13 years old, so I suppose this was his book in about 1926.

I scanned in two pages from the middle of the book. Note that the problems are pretty interesting and practical, and require a higher level of mathematical understanding than is typical in most 7th graders.