Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση

There being 11 decimal figures in the dividend, and none in the divisor, 11 figures are to be cut off in the quotient; but as the quotient itself consists of but 10 figures, prefix to them a cipher to complete that number. Divide 1.728 by .012 .012)1.728(144=quotient.

12

52

48

48

48

0

Because the number of decimal figures in the divisor and dividend, are alike, the quotient will be integers. Divide 2 by 3.1416

3.1416)2.0000,0(0.636618+=quotient.
1 8849 6

115040
94248

207920

188496

194240

188496

57440

31416

260240

251228

9012+

3

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
Divide 476 520 by .423

Divide .45695 by 12.5

Divide 2.3 by 96

Divide 87446071 by .004387

Divide .624672 by 482

= 1113.'
=1126.5+
=.0365+

=.02395+ =19933000000.

=.001296.

REDUCTION OF DECIMALS.

RULE I.

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 of 3 acres, miles, yards, &c. there

1

fore if 3 be divided by 4, the quotient is the answer required.

Reduce to a decimal fraction. Answer .4

[ocr errors]

Reduce

Reduce

Reduce

Reduce

.48.

.1146789

.7777+

.9130434+

Reduce,,,, and so on to, 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.

[ocr errors]

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 yulgar 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 ; then 12)9.00

=

.75 decimal frac[tion required.

Reduce 8 inches the decimal of a yard. 8 inches

1 yard x 3 x 12 = 36 inches.

36)8.0(.22 += Answer.

72

[blocks in formation]

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
4=
[in an acre.

1.3500

40= number of perch

[ocr errors]

[es in a rood.

14.0000

The value, therefore, is 1 rood 14 perches.

« ΠροηγούμενηΣυνέχεια »