A plain and comprehensive treatise of decimals and mensuration [electronic resource] : Calculated for the instruction and improvement of those who are desirous to be acquainted with figures, in accurate and useful Computations. Containing, I. An Application of Decimals to all the leading Branches of Arithmetic, in a Variety of Examples; together with the Doctrine of Circulating Decimals or Repetends. II. Interest in all its Cases, both Simple and Compound; with Constructions upon the Rules of Rebate or Discount: Likewise several new Methods adapted to the Valuing of Leases or Annuities on Lives. III. The Extraction and Uses of the Square and Cube Roots, particularly a new, short, and easy Method of Extracting the Cube Root. IV. Duodecimals, or Cross-Multiplication, by an easier Method than hitherto practised. V. Mensuration of all Kinds of Superficies and Solids, with practical Errors pointed out; together with the Art of Gaging, and some improv'd Methods in Surveying of Land: Also the various Uses of Specific Gravity. And to accommodate the above work, is added, VI. An introduction to practical music; together with the Construction of Organ Pipes, Spinets, &c. The Whole rendered familiar to the meanest Capacity. By Wm. Crumpton.