lasts gr. (1.) 36 9 bush. gr. DRY MEASURE. bush. p. qr. loads bush. lasts qr. p. 7 (2) 36 7 3 (3)36 1 2 (4)96 2 31 57 8 3 41 COMPOUND SUBTRACTION teaches us to find the difference between two compound quantities. RULE.-Place the less number under the greater, in such a manner, that the same denominations may stand under each other. Begin at the lowest denomination, and subtract the lower number from the upper one; when any of the lower denominations are greater than the upper, increase the upper number by as many as make one of the next superior denomination, from this sum take the figure in the lower line; put down the difference, and carry one to the next superior number in the lower line, and subtract as before, and so on, till you have gone through the question. Or: When any of the lower denominations are greater than the upper, subtract the lower denomination from as many as make one of the next superior, and add the top number to the remainder; put this sum down, and carry one to the next superior denomination in the lower line, and subtract as before. Proof as in Simple Subtraction. EXAMPLES. 1. From £29. 12s. 6d. take £14. 13s. 41d. 2, From 3 tons, 4 cwt. 2 qr. 15 lb. 12 oz. take 1 ton, 7 cwt. 2 qr, 18 lb. 10 oz. t. cwt. qr. lb. oz. 3 4 2 15 12 1 7 2 18 10 1 16 3 25 2 3 4 2 15 12 Proof. D 3 3. From 10 years take 9 years, 9 months, 9 weeks, 9 days and 9 hours. NOTE.-At days we have to borrow 2 weeks or 14 days, and carry 2 to the 9 weeks; at weeks we have to borrow 3 months or 12 weeks, and to carry 3 to the months. 5. Gave my butler £20 to settle two accounts, one of which was £15. 7s. 6d. and the other £4. 10s. 9d.: how much had he left? Ans. 1s. 9d. 6. A servant man, who had £26 15s. 6d. a year; now on the 1st of June, he drew 5 guineas, on the 1st of July £2. 3s. 4d., and on the 5th of November £7. 6s. 6d. : how much money will be due to him at the year's end? Ans. £12. Os. 8d. lb. oz. dwt gr. (3.) 74 10 9 18 12 6 18 20 4. Two silver pints were made, one of which weighed 8 oz. 10 dwt. 21 grains, and the other 10 oz. 4 dwt.: required their difference in weight. Ans, 1oz. 13dwt. 3gr. |