Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση

5. Value the following decimals, by inspection, and find their amount, viz.: 785 £.; '357 £.; '916 £.; "74 £.; 5 £.; '25 £.; '09 £.; and '008 £. Ans. 3£. 12 s. 11 d

SUPPLEMENT TO DECIMAL FRACTIONS.

QUESTIONS.

1. What are decimal fractions? 2. Whence is the term derived? 3. How do decimal differ from common frac tions? 4. How are decimal fractions written? 5. How can the proper denominator to a decimal fraction be known, if it be not expressed? 6. How is the value of every figure determined? 7. What does the first figure on the right hand of the decimal point signify? the second figure? third figure? fourth figure? 8. How do ciphers, placed at the right hand of decimals, affect their value? 9. Placed at the left hand, how do they affect their value? 10. How are decimals read? 11. How are decimal fractions, having different denominators, reduced to a common denominator? 12. What is a mixed number? 13. How may any whole number be reduced to decimal parts? 14. How can any mixed number be read together, and the whole expressed in the form of a common fraction? 15. What is observed respecting the denominations in federal money ? 16. What is the rule for addition and subtraction of decimals, particularly as respects placing the decimal point in the results? multiplication? division? 17. How is a common or vulgar fraction reduced to a decimal? 18. What is the rule for reducing a compound number to a decimal of the highest denomination contained in it? 19. What is the rule for finding the value of any given decimal of a higher denomination in terms of a lower? 20. What is the rule for reducing shillings, pence and farthings to the decimal of a pound, by inspection? 21. What is the reasoning in relation to this rule? 22. How may the three first figures of any decimal of a pound be reduced to shillings, pence and farthings, by inspection?

[ocr errors]

7 yds.

6

1. A merchant had several remnants of cloth, measuring as follows, viz. :

[merged small][ocr errors]

.....

[merged small][ocr errors][merged small]

EXERCISES.

.....

How many yards in the whole, and what would the whole come to at $3'67 per yard?

Note.

Reduce the common fractions to decimals. Do the same wherever they occur in the examples which follow.

Ans. 36'475 yards. $133'863+, cost.

2. From a piece of cloth, containing 36ğ yds., a merchant sold, at one time, 7 yds., and, at another time, 12§ yds.; how much of the cloth had he left? Ans. 167 yds.

3. A farmer bought 7 yards of broadcloth for 8 £., a barrel of flour for 2 £., a cask of lime for 18 £., and 7 lbs. of rice for £.; he paid 1 ton of hay at 3 £., 1 cow at 63 £., and the balance in pork at £. lb. ; many were the pounds of pork?

per

how

Note. In reducing the common fractions in this example, it will be sufficiently exact if the decimal be extended to three places. Ans. 108 lb. lbs. of butter cost? Ans. $4'7182.

4. At 124 cents per lb., what will 37

5. At $17'37 per ton for hay, what will 11 tons cost? Ans. $201 92§. 92% for 111⁄2 tons Ans. $1737. that per ton? Ans. $20.

8. At '4 of a dollar a gallon, what will '25 of a gallon of molasses cost? Ans. $1. 9. At $9 per cwt., what will 7 cwt. 3 qrs. 16 lbs. of sugar cost?

6. The above example reversed. At $201 of hay, what is that per ton?

7. If '45 of a ton of hay cost $9, what is Consult ¶ 65.

Note. Reduce the 3 qrs. 16 lbs. to the decimal of a cwt, extending the decimal in this, and the examples which follow, to four places. Ans. 71'035+.

10. At $69'875 for 5 cwt. 1 qr. 14 lbs. of raisins, what is that per cwt.? Ans. $13. 11. What will 2300 lbs. of hay come to at 7 mills per lb. ? Ans. $16'10.

12. What will 7654 lbs. of coffee come to,

Ib.?

N

at 18 cents per Ans. $13779

18. What will 12 gals. 3 qts. 1 pt. of gin cost, at 28 cents per quart? Note. Reduce the whole quantity to quarts and the decimal of a quart. Ans. 14'42

14. Bought 16 yds. 2 qrs. 3 na. of broadcloth for $100‘125; what was that per yard? Ans. $6.

15. At $1'92 per bushel, how much wheat may be bought for $72 ? Ans. 1 peck 4 quarts. much iron may be purAns. 13 cwt

16. At $9272 per ton, how chased for $60'268?

17. Bought a load of hay for $9'17, paying at the rate of $16 per ton; what was the weight of the hay?

Ans. 11 cwt. 1 qr.23 lbs. 18. At $302'4 per tun, what will 1 hhd. 15 gals. 3 qts. of wine cost? Ans. $94'50.

19. The above reversed. At $94'50 for 1 hhd. 15 gals. 3 qts. of wine, what is that per tun? Ans. $302'4.

Note. The following examples reciprocally prove each other, excepting when there are some fractional losses, as explained above, and even then the results will be sufficiently exact for all practical purposes. If, however, greater exactness be required, the decimals must be extended to a greater number of places.

20. At $1'80 for 31 qts. of wine, what is that per gal.? 22. If of a ton of potashes cost $60'45, what is that per ton?

21. At $2215 per gal., what cost 31 qts. ?

23. At $96'72 per ton for pot-ashes, what will of a tou

cost?

24. If '8 of a yard 25. If a yard of 26. At $25 per of cloth cost $2, cloth cost $2'5, yard, how much what is that per what will 8 of a cloth may be puryard? yard cost? chased for $2?

27. If 14 cwt. of 28. If a ton of 29. At 27 £.10 pot-ashes cost 19£. pot-ashes cost 27£. 5 s., what is that 10 s., what will 14

per ton?

cwt. cost?

a ton for pot-ashes,
what quantity may
be bought for 19 £.
5 s.?

Note. After the same manner let the pupil reverse and prove the following examples:

[ocr errors]

30. At $18'50 per ton, how much hay may be bought for $12'025 ?

31. What will 3 qrs. 2 na. of broadcloth cost, at $6 per yard?

32. At $22'10 for transportation of 65 cwt. 46 miles, what is that per ton?

4.

33. Bought a silver cup, weighing 9 oz. 4 pwt. 16 grs. for 8 £.2 s. 3 d. 33 q.; what was that per ounce ?

34. Bought 9 chests of tea, each weighing 3 cwt. 2 qrs. 21 lbs. at 4 £. 9 s. per cwt.; what came they to?

35. If 5 acres 1 rood produce 26 quarters 2 bushels of wheat, how many acres will be required to produce 47 quarters 4 bushels? A quarter is 8 bushels.

Note. The above example will require two operations, for which consult T 65, ex. 1.

36. A lady purchased a gold ring, giving at the rate of $20 per ounce; she paid for the ring $125; how much did it weigh?

REDUCTION OF CURRENCIES.

¶ 78. Previous to the act of Congress in 1786 establishing federal money, all calculations in money, throughout the United States, were made in pounds, shillings, pence and farthings, the same as in England. But these denominations, although the same in name, were different in value in dif ferent countries.

England,
Canada and

Nova Scotia,

The New Eng

land States, Virginia, Kentucky, and Tennessee,

Thus, 1 dollar is reckoned in

4 s. 6 d., called English, or sterling money.

5 s. called Canada currency.

New York,
Ohio, and
N. Carolina,

6 s., called New England currency.

8 s., called New York currency.

New Jersey,
Pennsylvania,
Delaware, and

Maryland,

S. Carolina and

1 dollar is reckoned in

fre

78. 6 d., called Pennsylvania currency.

9) 263'040

}

4 s. 8 d., called Georgia currency.

Georgia,

1. Reduce 6£. 11 s. 64 d. to federal money.

Note. To reduce pounds, shillings, pence and farthings, in either of the above-named currencies, to federal money,First, reduce the shillings, pence and farthings (if any be contained in the given sum) to the decimal of a pound by in spection, as already taught, ¶ 76.

6. 11 s. 64 d. = £6'576.

ENGLISH MONEY.-Now, supposing the above sum to be English money,-1£. is 20 s. = 240 pence, in all the above currencies. 1 dollar, in English money, is reckoned 4 s. 6 d 54 pence, that is, of 1 pound. Now, as many times as, the fraction which 1 dollar is of 1 pound, English money, is contained in £ 6'576, so many dollars, it is evident, there must be; that is,-To reduce English to federal money,-Divide the given sum by, the quotient will be federal money.

£6'576 English money.

40

29'226 federal money, Answer.

Note. It will be recollected, to divide by a fraction, we multiply by the denominator, and divide the product by the numerator.

CANADA CURRENCY.-Supposing the above sum to be Cana da currency,-1 dollar, in this currency, is 5 s. 60 pence, that is, of 1 pound. Therefore,-To reduce Cana da currency to federal money,-Divide the given sum by †, and the quotient will be federal money; or, which is the same thing,-Multiply the given sum by 4.

£6'576 Canada currency.

4

27'304 federal money, Answer.

« ΠροηγούμενηΣυνέχεια »