Published by Canadian Watchman Press, Oshawa, 1920, believe a 1937 reprint.  Hard cover, 295 pages including answer section.  Green cloth over boards with blocked title, Ontario Coat of Arms and lettering in black on front board, black lettering on spine.  Corners and spine ends show some wear, a few small spots on boards; small tear to cloth at top front edge.  Binding sound.  Some pencil and erasures to interior with lightly toned pages; no prior owner/school markings; soil spot on rear end paper; bit of soil on outer page block.  Covers Addition, Subtraction, Division, Multiplication, Numbers, Factors, Divisors, Fractions, Measurements, Percentages, Decimals, Taxes, Duty, Interest, Banking, Commission, Accounts, Interest, Stocks, Square Root, with exercises for each section and answers at the rear.