SECTION IX. COMPOUND MULTIPLICATION. CASE I. 1. If 1 quire of paper cost 8d., what will 2 quires cost? 3? 4? 2. If 1 bushel of corn cost 4s. 6d., what will 2 bushels cost? 3. What is the width of 2 boards, each of which is 1ft. 6in. wide? 4. What is the width of 3 boards? 4 boards? 5? 6? 7? 8? 5. If a man drink 2qt. 1pt. of water a day, how much will he drink in 2 days? In 3? În 4? In 5? In 6? In 7? In 8? 6. If 1 spoon weigh 2oz. 10dwt. what will 2 spoons weigh? 7. If a man walk 3m. 4fur. in an hour, how far will he walk in 2 hours? In 3? In 4? In 5? In 6? In 7? In 8? In 9? 8. What will 6 bales of cloth cost, at 7£. 12s. 7d. per bale? £ 12 d. 7 12 7 6 In this question, we multiply 7d. by 6 and find the product to be 42d. This we divide by 12, the number of pence in a shilling, and find it contains 3s., and 6d. remaining, which we write under the 45 15 6 pence, and carry 3 to the product of 6 times 12, and find the amount to be 75s. which we reduce to pounds by dividing them by 20, and find them to be 3£. 15s. We write down the shillings under the shillings and carry 3 to the product of 6 times 7£.; and we thus find the answer to be 45£. 15s. 6d. From the above illustration, we deduce the following RULE. When the quantity is less than 12, multiply the price by the quantity, and carry as in Compound Addition. NOTE. For the answers in Multiplication, see Section 10, in Division. 9. Multiply 18£. 16s. 74d. by 4. 10. Multiply 15£. 11s. 8 d. by 8. 11. Multiply 27 £. 19s. 114d. by 9. 12. Multiply 19£. 5s. 74d. by 11. 13. Multiply 81 £. 14s. 9d. by 8. 14. Multiply 15£. 18s. 5d. by 7. 15. Multiply 13£. 5s. 44d. by 12. Ans. 75£. 6s. 6d. Ans. 124£. 13s. 10d. Ans. 251£. 19s. 74d. 16. Multiply 17lb. 7oz. 13dwt. 13gr. by 9. 17. Multiply 15lb. 11oz. 19dwt. 15gr. by 7. Ans. 212£. 1s. 73d. Ans. 653£. 18s. Od. Ans. 111£. 8s. 11d. Ans. 159£. 4s. 9d. 18. Multiply 16T. 12cwt. Sqr. 13lb. 12oz. by 11. 19. Multiply 13T. Scwt. 1qr. 14lb. 18oz. by 8. 20. Multiply 2fb. 53. 53.19. 16!gr. by 8. 21. Multiply 47yds. 3qr. 2na. 2in. by 7. 22. Multiply 17m. 7fur. 36rds. 13ft. 7in. by 12. 23. Multiply 16deg. 39m. 3fur. 39rds. 5yds. 2ft. by 9. 26. Multiply 7 cords, 116ft. 1629in. by 4. 27. Multiply 29hhd. 61 gal. 3qt. 1pt. 3gi. by 7. 33. If a man gives each of his 9 sons 23A. 3R. 19p. what do they all receive? 34. If 12 men perform a piece of labor in 7h. 24m. 30s. how long would it take 1 man to perform the same task? 35. If 1 bag contain 3bu. 2pk. 4qt. what quantity does 8 bags contain? CASE II. When the quantity is more than 12 and is a composite number, that is, a number, which is the product of two or more numbers, the question is performed as in the following EXAMPLE. 36. What will 42 yards of cloth cost at 6s. 9d. a yard? £. s. d. 069 2 0 6 6= price of 6 yds. 14 3 6=price of 42 yds. In this example, we find that 6 multiplied by 7 will produce the quantity 42 yards. We therefore multiply 6s. 9d. first by the 6, and then its product by 7; and the last product, 14£. 3s. 6d. is the answer or price of the 42 yards. The pupil will now see the propriety of the following RULE. Multiply the price by one of the factors of the composite number, and the product by the other. 37. What will 16 yards of velvet cost at 3s. 8d. per yard? 38. What will 72 yards of broadcloth cost, at 19s. 11d. per yard ? 39. What will 84 yards of cotton cost, at 1s. 11d. per yard? 40. Bought 90 hogsheads of sugar, each weighing 12cwt. 2qr. 11lb.; what was the weight of the whole? 41. What cost 18 sheep at 5s. 94d. a piece? 42. What cost 21 yards of cloth at 9s. 11d. per yard? 43. What cost 22 hats at 11s. 6d. each? |