The processes in the foregoing examples may now be pre sented in the form of a

RULE for the Multiplication of RULE for the Division of Com Compound Numbers.

pound Numbers. I. When the divisor does

I. When the multiplier does not exceed 12, multiply suc- not exceed 12, in the manner cessively the numbers of each of short division, find how denomination, beginning with many times it is contained in the least, as in multiplication the highest denomination, unof simple numbers, and carry der which write the quotient, as in addition of compound and, if there be a remainder, numbers, setting down the reduce it to the next less dewhole product of the highest nomination, adding thereto the denomination.

number given, if any, of that denomination, and divide as before; so continue to do through all the denominations, and the several quotients will be the answer.

II. If the multiplier exceed II. If the divisor exceed 12, 12, and be a composite num- and be a composite, we may diber, we may multiply first by vide first by one of the comone of the component parts, ponent parts, that quotient by that product by another, and another, and so on, if the com go on, if the component parts ponent parts be more than be more than two; the last two; the last quotient will be product will be the product re- the quotient required. quired.

III. When the multiplier III. When the divisor exexceeds 12, and is not a com- ceeds 12, and is not a composite, multiply first by 10, posite number, divide after the and this product by 10, which manner of long division, setwill give the product for 100; ting down the work of di- and if the hundreds in the mul-viding and reducing. tiplier be more than one, multiply the product of 100 by the number of hundreds; for the tens, multiply the product of 10 by the number of tens; for the units, multiply the multiplicand; and these several products will be the product required.

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EXAMPLES FOR PRACTICE.

1. What will 359 yards of 2. Bought 359 yards of cloth cloth cost, at 4 s. 71 d. per Fard? ·

3. In 241 barrels of flour, tach containing 1 cwt. 3 qr. lb.; how many cwt. ? 5. How many bushels of wheat in 135 bags, each containing 2 bu. 3 pks. ?

3 X 9 X 5: 135. 7. What will 35 cwt. of tobacco cost, at 3 s. 10 lb.?

for 83 £.0 s. 41 d.; what was that a yard?

4. If 441 cwt. 13 lb. of flour be contained in 241 barrels, how much in a barrel ?

6. If 371 bu. 1 pk. of wheat be divided equally into 135 bags, how much will each bag contain?

S. At 759 £. 10 s. for 35 d. per cwt. of tobacco, what is that per lb. ?

9. If 14 men build 12 rods 10. If 14 men build 92 rods 6 feet of wall in one day, how 12 feet of stone wall in 7 many rods will they build in days, how much is that per 75 days? day?

¶ 42. 1. At 10 s. per yard, what will 17849 yards of cloth cost?

Note Operations in multiplication of pounds, shillings, pence, or of any compound numbers, may be facilitated by taking aliquot parts of a higher denomination, as already explained in "Practice" of Federal Money, T 29, ex. 10. Thus, in this last example, the price 10 s. of a pound; therefore, of the number of yards will be the cost in pounds. 178498924 £. 10 s. Ans.

=

2. What cost 34648 yards of cloth, at 10 s. or £. per at 5 s.. per at 4 s.. at 3 s. 4 d.

yard?

per yard?
To £. per yard?

yard?

at 2 s.

£. per yard? Ans. to last, 3464 £. 16 s. sugar, at 6 d. = s. per lb?

3. What cost 7430 pounds of
at 4 d. -
s. per lb.?
at 2 d. s. per ib.?

lb, ? per lb. ?

at 3 d.

s. per

=

Ans. to the last, 14.30 s. = 928 s. 9 d. — 46 £. 8 s. 9 d. 4. At $1875 per cwt., what will 2 qrs. = cwt. cost? what will 1 qr.: cwt. cost?

cwt. cost?

what will 8 lbs.

what will 16 lb.

what will 14 lbs. = cwt. cost?

cwt. cost?

Ans. to the last, $1'339.

5. What cost 340 yards of cloth, at 12 s. 6 d. per yard? 10 s. (£.) and 2 s. 6 d. (= £.); there

12 s. 6 d. fore,

2 s. 6 d. of 10 s.) 170 £.

at 10 s. per yard.

42 £. 10 s. at 2 s. 6d. per yard.

Ans. 212 £. 10 s. at 12 s. 6 d. per yard.

SUPPLEMENT TO THE ARITHMETIC OF COMPOUND NUMBERS.

QUESTIONS.

6. When

1. What distinction do you make between simple and compound numbers? ( 26.) 2. What is the rule for addition of compound numbers? 3. for subtraction of, &c.? 4. There are three conditions in the rule given for multiplication of compound numbers; what are they, and the methods of procedure under each? 5. The same questions in respect to the division of compound numbers? the multiplier or divisor is encumbered with a fraction, how do you proceed? 7. How is the distance of time from one date to another found? 8. How many degrees does the earth revolve from west to east in 1 hour? 9. In what time does it revolve 1°? Where is the time or hour of the day earlier at the place most easterly or most westerly? 10. The difference in longitude between two places being known, how is the difference in time calculated? 11. How may operations, in the multiplication of compound numbers, be facilitated? 12. What are some of the aliquot parts

· of 1 s. ?

of 1 cwt.? 13. What is this

of 1 £.?
manner of operating usually called?

EXERCISES.

1. A gentleman is possessed of 14 dozen of silver spoons, each weighing 3 oz. 5 pwt.; 2 doz. of tea spoons, each weighing 15 pwt. 14 gr.; 3 silver cans, each 9 oz. 7 pwt.; 2 silver tankards, each 21 oz. 15 pwt.; and 6 silver porringers, each 11 oz. 18 pwt.; what is the weight of the whole ?

Ans. 18 lb. 4 oz. 3 pwt.

Note. Let the pupil be required to reverse and prove the following examples:

2. An English guinea should weigh 5 pwt. 6 gr.; a piece of gold weighs 3 pwt. 17 gr.; how much is that short of the weight of a guinea ?

3. What is the weight of 6 chests of tea, each weighing 3 cwt. 2 qrs. 9 lb. ?

4. In 35 pieces of cloth, each measuring 27 yards, how many yards?

5. How much brandy in 9 casks, each containing 45 gal. 3 qts. 1 pt.?

6. If 31 cwt. 2 qrs. 20 lb. of sugar be distributed equally into 4 casks, how much will each contain?

7. At 43 d. per lb., what costs 1 cwt. of rice?

2 cwt.? 3 cwt.? Note. The pupil will recollect, that 8, 7 and 2 are factors of 112, and may be used in place of that number.

8. If 800 cwt. of cocoa cost 18 £. 13 s. 4 d., what is that per cwt.? what is it per lb.?

9. What will 94 cwt. of copper cost at 5 s. 9 d. per lb. ? 10. If 64 cwt. of chocolate cost 72 £. 16 s., what is that per lb. ?

11. What cost 456 bushels of potatoes, at 2 s. 6 d. per bushel?

Note. 2s. 6d. is of 1 £. (See T 42.)

12. What cost 86 yards of broadcloth, at 15 s. per yard ? Note. Consult ¶ 42, ex. 5.

13. What cost 7846 pounds of tea, at 7 s. 6 d. per lb.? at 14 s. per lb. ? at 13 s. 4 d. ?

14. At $94 25 per cwt., what will be the cost of 2 qrs. of tea?

of 14 lbs. ?

of 3 qrs.?
of 24 lbs. ?

of 16 lbs. ?

Note. Consult ¶ 42, ex. 4 and 5.

of 21 lbs. ?

15. What will be the cost of 2 pks. and 4 qts. of wheat, at $1'50 per bushel?

16. Supposing a meteor to appear so high in the heavens as to be visible at Boston, 71° 3', at the city of Washington, 77° 43', and at the Sandwich Islands, 155° W. longitude, and that its appearance at the city of Washington be at 7 minutes past 9 o'clock in the evening; what will be the hour and minute of its appearance at Boston and at the Sandwich Islands?

¶ 43. We have seen, (T 17,) that numbers expressing whole things are called integers, or whole numbers; but that, in division, it is often necessary to divide or break a whole thing into parts, and that these parts are called factions, or broken numbers.

It will be recollected, (¶ 14, ex. 11,) that when a thing or unit is divided into 3 parts, the parts or fractions are called thirds; when into four parts, fourths; when into six parts, sixths; that is, the fraction takes its name or denomination from the number of parts, into which the unit is divided. Thus, if the unit be divided into 16 parts, the parts are called sixteenths, and 5 of these parts would be 5 sixteenths, expressed thus, The number below the short line, (16,) as before taught, (T 17,) is called the denominator, because it gives the name or denomination to the parts; the number above the line is called the numerator, because it numbers the parts.

The denominator shows how many parts it takes to make a unit or whole thing; the numerator shows how many of these parts are expressed by the fraction.

1. If an orange be cut into 5 equal parts, by what fraction is 1 part expressed? - 2 parts? 3 parts? 5 parts? how many parts make unity

4 parts ?

or a whole orange?

2. If a pie be cut into 8 equal pieces, and 2 of these pieces be given to Harry, what will be his fraction of the pie? if 5 pieces be given to John, 'what will be his fraction? what fraction or part of the pie will be left?

It is important to bear in mind, that fractions arise from Avision, (¶ 17,) and that the numerator may be considered a

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