Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση
[ocr errors]
[merged small][merged small][ocr errors]
[ocr errors]

CONDITTI POTI SOTA: * --
Sims 2 TAIES TO
za bege mat der inome pu preporum

La these questions to ?"87* *****
terms, er beste recome
guished into
there being alvm. U tom. Trang
latter, van TT TIL SEX
The metini u muus

Set dont le com
which is of the man
one of the other
ing terms which is set 0
of them for a firs. 2
to the directions priza na ki
with another term doo
manding term; and sca
kind; setring the numbers:
the left-hand side si me

**vintor
others on the

Bs sesers met
the micdit te
Rulessé- Torrent
a fourth
the EN
nex TTC
order

2

a number, is an expression of a Comething considered as a whole. :?

zinbers, placed one below the other,

[ocr errors]

1

[ocr errors]

};

which is named 3-fourths.

02, 2

, or number placed below the line, shows
varts the whole quantity is divided into;
the Divisor in Division. And the Numera
net above the line, shows how many of these
sed by the Fraction; being the remainder
-Also, both these numbers are, in general,
rms of the Fraction.

}?!
are either Proper, Improper, Simple, Com-
lixed.
r Fraction, is when the numerator is less than the
tor; as, id or ļ, or , &c.
proper Fraction, is when the numerator is equal to,
is, the denominator ; as, k, or, or }, &c.
..ple Fraction, is a single expression, denoting any
r of parts of the integer; as, , or
Compound Fraction, is the fraction of a fraction, or
actions connected with the word of between them;

off of 3, &c.
mber, is composed of a whole number and a
P;'as, 34, or 12, &c.
E 2

A whole

EXAMPLES.

1. How many men can complete a trench of 135 yards long in 8 days, when 16 men can dig 54 yards in 6 days?

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

432) 12960 ( 30 Ans. by one operatios,

1296

[ocr errors]

The same by two Operations.
Ist.

2d.
As 54 : 16 :: 135 : 40 As 8 : 40 :: 6 : 30

6

16

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

2. If 100l in one year gain 51 interest, what will be the interest of 7507 for 7 years?

Ans. 2621 105. 3. If a family of 8 persons expend 2002 in 9 months ; how much will serve a family of 18 people 12 months ?

Ans. 300% 4. If 27s be the wages of 4 men for 7 days; what will be the wages of 14 men for 10 days ?

Ans. 61 15s. 5. If a footman travel 130 miles in 3 days, when the days are 12 hours long; in how many days, of 10 hours each, may he travel 360 miles?

Ans. 9 days.

Ex. 6..

Ex. 6. If 120 bushels of corn can serve 14 horses 56 days; how many days will 94 bushels serve 6 horses ?

Ans. 102 days. 7. If 3000 lb of beef serve -340 men 15 days; how niany lbs will serve 120 men for 25 days? Ans. 1764 lb 11 * oz.

8. If a barrel of beer be sufficient to last a family of 8 per-, sons 12 days; how many barrels will be drank by 16 persons in the space of a year?

Ans 60{ barrels. 9. If 180 men, in 6 days, of 10 hours each, can dig a trench 200 yards long, 3 wide, and 2 deep; in how many, days, of 8 hours long, will 100 men dig a trench of 360 yards. long, 4 wide, and. 3 deep?

Ans. 15 days.

[ocr errors]

I

OF VULGAR FRACTIONS.

A FRACTION, or broken number, is an expression of a part, or some parts, of something considered as a whole.

It is denoted by two numbers, placed one below the other, with a line between them:

3 numerator Thus,

which is named 3-fourths.

4 denominator }; which

The Denominator, or number placed below the line, shows how many equal parts the whole quantity is divided into; and it represents the Divisor in Division. And the Numerator, or number set above the line, shows how many of these parts are expressed by the Fraction; being the remainder after division.-Also, both these numbers are, in general, named the Terms of the Fraction,

Fractions are either. Proper, Improper, Simple, Compound, or Mixed.

A Proper Fraction, is when the numerator is less than the denominator; as, t, or, or, &c.

An Improper Fraction, is when the numerator is equal to, or exceeds, the denominator ; as, ti or 4, or }, &c.

A Simple Fraction, is a single expression, denoting any number of parts of the integer; as, ş, or to

A Compound Fraction, is the fraction of a fraction, or several fractions connected with the word of between them; as, į of j, or off of 3, &c.

A Mixed Number, is composed of a whole number and a fraction together; as, 31, or 12, &c.

E 2

A whole

A whole or integer number may be expressed like a fraction, by writing 1 below it, as a denominator ; so 3 is t, or 4 is , &c.

A fraction denotes division ; and its value is equal to the quotient obtained by dividing the numerator by the denominator : so' is equal to 3, and ? is equal to 4.

Hence then, if the numerator be less than the denominator, the value of the fraction is less than 1. But if the numerator be the same as the denominator, the fraction is just equal to 1. And if the numerator be greater than the denomi, nator, the fraction is greater than 1.

REDUCTION OF VULGAR FRACTIONS,

REDUCTION of Vulgar Fractions, is the bringing them out of one form or denomination into another; commonly to prepare them for the operations of Addition, Subtraction, &ca of which there are several cases.

PROBLEM,

To find the Greatest Common Measure of Two or more Numbers.

THE Common Measure of two or more numbers, is that mumber which will divide them both without remainder; so, $ is a common measure of 18 and 24; the quotient of the former being 6, and of the latter 8. And the greatest number that will do this, is the greatest common measure : so 6 is the greatest common measure of 18 and 24 ; the quotient of the former being 3, and of the latter 4, which will not both divide further.

RULE.

If there be two numbers only; divide the greater by the less; then divide the divisor by the remainder ; and so on, dividing always the last divisor by the last remainder, till nothing remains; so shall the last divisor of all be the greatest common measure sought.

When there are more than two numbers, find the greatest common measure of two of them, as before; then do the same for that common-measure and another of the numbers;

and

and so on, through all the numbers; so will the greatest common measure last found be the answer.

If it happen that the common measure thus found is 1.5 then the numbers are said to be incommensurable, or not baving any common measure.

EXAMPLES.

[ocr errors]

1. To find the greatest common measure of 1908, 936, and 630. 936) 1908 (2 So that 36 is the greatest common 1872

measure of 1908 and 936.

[blocks in formation]

Hence then 18 is the answer required.
2. What is the greatest common measure of 246 and 372?

Ans. 6. 3. What is the greatest common measure of 324, 612, and 1032?

Ans. 12.

CASE I.

To Abbreviate or Reduce Fractions to their Lowest Terms.

* Divide the terms of the given fraction by any number that will divide them without a remainder; then divide these

quotients

* That dividing both the terms of the fraction by the same number, whatever it be, will give another fraction equal to the former, is evident. And when these divisions' are performed as often as can be done, or when the common divisor is the greatest possible, the terms of the resuluing fraction must be the least possible.

Note. 1. Any number ending with an even number, or a cipher, is divisible, or can be divided, by 2.

2. Any number ending with 5, or 0, is divisible by 5.

« ΠροηγούμενηΣυνέχεια »