An essay to facilitate vulgar fractions [electronic resource] : after a new method, and to make arithmetical operations very concise: Containing,. Many New and Excellent Rules on Vulgar Fractions and Mix'd Numbers; some Critical Observations on Numbers; Multiplication and Division of Money, Weight and Measure; with these following Practical Rules, viz. I. Fellowship, II. Barter, III. Loss and Gain, IV. Interest, V. Rebate or Discount, VI. Exchange. To which is annex'd, various practical and, lastly, Miscellaneous questions, with their answers. By W. Bridges, Schoolmaster in Rotterdam.