The London Gentleman's and Schoolmaster's Assistant: Containing. An easy and very comprehensive system of practical arithmetic. Great variety of bills of parcels, promissory notes, and receipts. An abstract of chronology. An extensive geographical table, shewing the direct distance, bearing, and probable time of sailing from London, to the principal places on the earth. A number of original questions as exercises. I.. II.. III.. IV.. V.

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author and sold, 1787 - Arithmetic - 183 pages
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Page 83 - Reduce compound fractions to simple ones, and mixt numbers to improper fractions ; then multiply the numerators together for a new numerator, and the denominators for. a new denominator.
Page 73 - To reduce a mixed number to an improper fraction, — RULE : Multiply the whole number by the denominator of the fraction, to the product add the numerator, and write the result over the denominator.
Page 74 - RULE. — Multiply all the numerators together for a new numerator, and all the denominators for a new denominator ; then reduce the new fraction to its lowest terms.
Page 131 - A man bought a horse, and by agreement was to give a farthing for the first nail, two for the second, four for the third, &c. There were four shoes, and eight nails in each shoe ; what did the horse come to at that rate ? 4473924 5s.
Page 44 - RULE. Divide the lowest denomination given, by so many of that name, as make one of the next higher, and thus continue, till you have brought it into that denomination, which your question requires.
Page 75 - To reduce a fraction of one denomination to the fraction of another, but greater, retaining the same value. RULE.
Page 17 - A Barrel of Salmon or Eels, is 42 Gallons. A Barrel of Herrings, - 32 Gallons. A Keg of Sturgeon, - 4 or 5 Gallons. A Firkin of Soap, - - - - 8 Gallons. DRY MEASURE. Marked. > Pints - - make i Quart - - I $ts
Page 17 - Beer measure ? A. In London only they compute 8 gallons to the firkin of ale, and 32 gallons to the barrel ; but in all other parts of England, for ale, strong beer, and small beer, 34 gallons are computed to the barrel, and 8 gallons and a half to the firkin.
Page 81 - When the lower fraction is greater than the upper, subtract the numerator of the lower fraction from the denominator, and to that difference add the upper numerator, carrying one to the unit's place of the lower whole number.
Page 10 - ... give the quotient required. — But as it sometimes happens that there is a remainder to each of the quotients, and neither of them the true one, it may be found by this RULE. Multiply the first divisor by the last remainder, and to the product add the first remainder, which will give the true one.

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