Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση

In this example there are four decimal figures in the divisor, and none in the dividend ; therefore, according to the rule, four ciphers are annexed to the dividend, which in this condition, is yet less than the divisor. A cipher must then be put in the quotient, in the place of integers, and other ciphers annexed to the dividend, and the division being now performed, the decimal figures of the quotient are obtained. Divide 7234.5 by 6.5 Quotient=1113. Divide 476.520 by .423

-=1126.5+ Divide .45695 by 12.5

-=.0365+ Divide 2.3 by 96

=.02395+ Divide 87446071 by .004387 -=19933000000. Divide .624672 by 482

=.001296. REDUCTION OF DECIMALS. .

RULE 1.

To reduce a Vulgar Fraction to a Decimal of the

same value.

Having annexed a sufficient number of ciphers, as decimals, to the numerator of the vulgar fraction, divide by the denominator; and the quotient thence arising, will be the decimal fraction required.

EXAMPLES.

Reduce to a decimal fraction.

4)3.00

.75=decimal required. For of one acre, mile, yard, or any thing, is equal to 1 of 3 acres, miles, yards, &c. there

fore if 3 be divided by 4, the quotient is the answer required. Reduce to a decimal fraction. Answer .4 Reduce

.48 Reduce its

.1146789 Reduce 3

.7777+ Reduce it

.9130434+ Reduce i, }, , }, and so on to 3', to their corresponding decimal fractions, and in this operation the various modes of interminate decimals may be easily observed,

RULE II.

To reduce Quantities of the same, or of different

Denominations to Decimal Fractions of higher denominations.

If the given quantity consist of one denomination only, write it as the numerator of a vulgar fraction; then consider how many of this make one of the higher denomination, mentioned in the question, and write this latter number under the former, as the denominator of a vulgar fraction. When this has been done, divide the numerator by the denominator, as directed in the foregoing rule, and the quotient resulting will be the decimal fraction required.

But if the given quantity contain several denominations, reduce them to the lowest term for the numerator; reduce likewise that quantity, whose fraction is sought, to the same denomination for the denominator of a vulgar fraction; then divide as before directed.

EXAMPLES.

Reduce 9 inches to the Decimal of a foot,

The foot being equal to 12 inches, the vulgar fraction will be t ; then 12)9.00

.75=decimal frac

[tion required. Reduce 8 inches to the decimal of a yard.

8 inches.

1 yard x 3 x 12 = 36 inches.

36)8.00.22 + Answer.

72

80
72

8

Reduce 5 furlongs 12 perches to the decimal of a mile. 1 mile

5 furlongs
40

8

[blocks in formation]

Reduce 21 minutes 54 seconds to the decimal of

a degree. Ans. .365 Reduce .056 of a pole to the decimal of an Acre,

Ans. .00035

Reduce 13 cents to the decimal of an Eagle.

Ans. .013 Reduce 14 minutes to the decimal of a day.

Ans. .00972+ Reduce 3 hours 46 minutes to the decimal of a

week. Ans. .0224206+

RULE III.

To find the value of Decimal Fractions in terms of

the lower denominations. Multiply the given decimal by the number of the next lower denomination, which makes an integer of the present, and point off as many places at the right hand of the product, for a remainder, as there are figures in the given decimal. Multiply this remainder by the number of the next inferior denomination, and point off a remainder, as before. Proceed in this manner through all the parts of the integer, and the several denominations, standing on the left hand, are the value required.

EXAMPLES.
Required the value of .3375 of an acre.

4 = number of roods

[in an acre. 1.3500

number of perch

[es in a rood:

14.0000 The value, therefore, is 1 rood 14 perches.

40 =

What is the value of .6875 of a yard ?

3=number of feet in a

[yard. 2.0625 12=number of inches in

[a foot. .7500 12=number of lines in

[an inch. 9.0000 The answer here is 2 feet 9 lines. What is the value of .084 of a furlong? Ans. 3

per. 1 yd. 2 ft. 11 in. What is the value of .683 of a degree? Ans. 40

m. 58 sec, 48 thirds. What is the value of .0053 of a mile ? Ans. I

per. 3 yds. 2 ft. 5 in. + What is the value of .036 of a day?

Ans. 51' 50" 24".

PROPORTION IN DECIMAL FRACTIONS. Having reduced all the fractional parts in the given quantities to their corresponding decimals, and having stated the three known terms, so that the fourth, or required quantity, may be as much greater, or less than the third, as the second term is greater, or less than the first, then multiply the second and third terms together, and divide the product by the first term,' and the quotient will be the answer ;-in the same denomination with the third term.

EXAMPLES.

If 3 acres 3 roods of land can be purchased for 93 dollars 60 cts. how much will 15 acres 1 rood cost at that rate ?

« ΠροηγούμενηΣυνέχεια »