# The Most General School-assistant: Containing, a Complete System of Arithmetic: the Common and Useful Problems in Practical Geometry: the Methods Used in Taking the Dimensions of Artificers Work: Mensuration of All Kinds of Superficies and Solids, of Artificers Work, of Timber, and of Land: Together with Guaging, Bills of Parcels, &c. &c

R. Trewman, 1770 - Arithmetic - 191 pages
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Page 82 - A cone is a solid figure described by the revolution of a right-angled triangle about one of the sides containing the right angle, which side remains fixed.
Page 8 - Multiply the numerators together for a new numerator, and the denominators together for a new denominator.
Page 24 - If a man perform a journey in 15 days when the days are 12 hours long, in how many will he do it when the days are but 10 hours long ? Ans.
Page 12 - RULE. Multiply the numerators together for the numerator, and the denominators together for the denominator of the required fraction.
Page 152 - If a footman travel 130 miles in 3 days, when the days are 12 hours long ; in how many days, of 10 hours each, may he travel 360 miles ? Ans. 9|f days. 5. If 120 bushels of corn can serve 14 horses 56 days, how many days will 94 bushels serve 6 horses?
Page 62 - How many strokes do the clocks of Venice, which go on to 24 o-clock, strike in the compass of a day?
Page 14 - When a decimal number is to be multiplied by 10, 100, 1000, &c., the multiplication may be made by removing the decimal point as many places to the right hand as there are ciphers in the multiplier, and if there be not so many figures on the right of the decimal point, supply the deficiency by annexing ciphers "10 l...
Page 7 - NOTE. — A fraction, strictly speaking, is less than a unit ; hence, if the numerator is equal to, or greater than, the denominator, it expresses a unit or more than a unit, and is therefore called an improper fraction. A mixed number is a whole number with a fraction; as, 7^, 5f.
Page 58 - ... be allowed to keep the remaining \$70 ? Ans. 1 yr. 11 mo. 25 d., about. Another common but incorrect method. To find the time when several debts, due at different times, can be paid at once, without loss to either debtor or creditor, merchants usually Multiply each debt by the time to elapse before it is due, and divide the sum of the products by the sum of the debts. Though this method is inaccurate it is easy, and experiment shows it may be employed without much error, to find the mean time...