XIV. PRACTICE. So called from the general ufe it is of to all perfons concerned in trade and bufinefs. I When a question in the rule of three has 1 for the firft term, it is more expeditioufly refolved, by taking fome aliquot part, or parts of the thing propofed; by which means many tedious reductions may be avoided. In order to perform this rule expeditously, let the learner get by heart the following CASE I Of a Ton The even Parts of WEIGHT. Of a Hundred Of a Quarter of a Hundred lb. gr. lb. I .or 28 2 or 56 2 4 7 14 14 When the price is less than a penny, RULE. Divide by the aliquot parts that are in a penny, then by 12 and 20, which will give the answer. The price being a farthing a yard, the given quantity is confequently fo many farthings, and a farthing being of a penny, and a penny the of a fhilling; and a fhilling the of a pound; therefore the divifors are 4, 12, and 20. CASE 2. When the given price is a fraction, RULE. Multiply the given number or quantity by the numerator, and divide the product by the denominator; the quotient will be the anfwer in the fame denomination with the whole number, of what the price is a part. EXAMPLES. What will the carriage of 8372 . come to, at of a penny per it? CASE 3. When the price is less than a fhilling, RULE. Take the aliquot part or parts that are in a fhilling, and add them together, and the fum will be the answer in fhillings, &c. which, divided by 20, will give pounds, &c. EXAMPLES. 12)24501 Pieces, at 14. per piece? 1400 Yards, at 11d. each? 6 1 1401, at 6d? 6|| 1631, at 7d 6 | | 112 lb. at 11d? Sometimes the value may be eafily found by reckoning the price of fome even number above what is given, which done, take fome aliquot part for what it is above, and subtract it from the former, When the price is 2, 3, 4, 6, or 8 pence, you may make use of this method; thus, for 2d. divide the given quantity by 120; for 3d. by 80; for 4d. by 60; for 6d. by 40, and for 8d. by 30, which will give the anfwer in pounds, &c. CASE 4. When the given price is more than a fhilling but less than two, RULE. Leave the top line, or given quantity, for fhillings, and take your parts as before for the remaining pence and farthings, which add to the given quantity, and the fum will be the answer in fhillings, &c, which divided by 20, will give pounds. EXAMPLES. 261 Ells, at is. 1d. per ell? 3| 4|578 Yards, at 1s. 3d.? 21-9 20/2812 9 144-6 207212 6 £. 151 II 8 Answer £. 118 CASE 5. If at fuch a profit in the fhilling, you would know what is gained per Cent, RULE. |