Howard's California Calculator, the Newest, Quickest and most Complete Instructor for all who desire to be "Quick at Figures." The Business Man's Faithful Assistant, the School Boy's Companion and Friend.

Original publisher's brown paper wrappers. Text printed in black ink. 4 1/4" x 6 1/2." Ninety-four pages, complete. One black-and-white frontispiece portrait illustration, complete. Pages are clean and intact except for light age toning, tiny spots limited to edges of text block, a chip in lower-left corner of front free endpaper, a closed tear measuring 2" on Pages 65-66, and a pencil scribble on Page 71. Covers are clean and intact overall but have darkening, a closed tear measuring 1 1/2" from fore-edge on back, tiny spots and a few smudges on front and back, moderate splitting along spine, and chips at head and tail of spine. A Good copy. This is a compendium of math "shortcuts" and rules that help in expediting math calculations. Some of the rules are aimed toward farmers and tradesmen. The math guidelines shown and explained herein address subjects such addition of fractions, compound interest, division of fractions, squaring numbers, marking goods, multiplication, subtraction of fractions, square and cube roots, stocks and bonds, finding the greatest common factor or divisor, finding the least common multiple, measuring grain, measuring land without instruments, laying off a square corner, measuring grindstones, finding the difference of time between any two dates, finding the day of the week with the date being given, and a table of weights and measures.…