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" Four points set in the middle of four numbers, denote them to be proportional to one another, by the rule of three ; as 2 : 4 : : 8 : 16 ; that is, as 2 to 4, so is 8 to 16. "
Logarithmick Arithmetick: Containing a New and Correct Table of Logarithms ... - Σελίδα 6
1818 - 251 σελίδες
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Connolly's Arithmetic: Or, The Ohio Accomptant: Being a Plain Practical ...

James L. Connolly (mathematician.) - 1829 - 266 σελίδες
...10-3-2=5, that is, 10 divided by 2 equal 5. ) ( The reverse parenthesis also denote Division. • : Four points, set in the middle of four numbers, denote them to be in Proportion to one another, by the Kule of Three ; as, 4 : 6 : : 8 : 12, that is, as 4 is to 6, so...

The Arithmetical Manual

Samuel Read Hall - 1832 - 294 σελίδες
...number, is the divisor : thus 5r\°- is the same as 240-=-16=15. : : : : Sign of proportion ; thus, 2 : 4 : : 8 : 16 ; that is, as 2 is to 4, so is 8 to 16. —. Sign of Geometrical progression. 9 — 2-)-6=13 ; that is, the difference between 9 and 2 added...

The Tutor's Assistant: Being a Compendium of Arithmetic and a Complete ...

Francis Walkingame - 1832 - 224 σελίδες
...as 8-=-2=l, that is, S, divided by 2 is equal to 4. el So is. — The sign of Proportion; as 2:4X8: 16, that is, as 2 is to 4,' so is 8 to 16. 7— 2+5=10.— Sheivs that the difference between 2 and _ 7, added to 5 is equal to 10. 0—2+5=2....

Rose's New Arithmetic: An Explanatory and Practical Arithmetic, Adapted to ...

John Rose - 1835 - 192 σελίδες
...4=8. X multiplication; as, 4X3=12. -r- division; as, 16-:-4=4; or, 4)16(4; or, y=4 : :: : proportion ; as, 2 : 4 : : 8 : 16 ; that is, as 2 is to 4 so is 8 to 16 : or, the same proportion I hut 4 is to 2, so is 16 to 8. 13 — 3+5=4 a vinculum ; the line over the...

The wine and brandy dealer's complete guide and stock book

Samuel Roose - 1835 - 164 σελίδες
...quarters=Jcwt,, signifies that 4 quarters are equal to 1 cwt, : is, : : so is, the sign of proportion. As 2 : 4 :: 8 : 16; that is, as 2 is to 4, so is 8 to 16. The two signs of comparison, 7 and / . The sign 7 is of greater than. As a 7 b signifies that a is...

The Western Arithmetic: Or, Pennsylvania and Ohio Accomptant: Being a Plain ...

James L. Connolly (mathematician.) - 1835 - 264 σελίδες
...as, I0-H?.=5, that is, 10 divided by 2 equal 5. ) ( The reverse parenthesis also denote Division. : : Four points, set in the middle of four numbers, denote them to be in Proportion to one another, by the Kule of Three ; as, 4 : 6 : : 8 i 12, that is, as 4"is to 6, s»...

Daboll's Schoolmaster's Assistant: Improved and Enl. ...

Nathan Daboll - 1837 - 262 σελίδες
...signifies that 8 divided by 2, is equal" to 4 ; or thus, |=4, each of which signify the same thing. : : Four points set in the middle of four numbers, denote...rule of three ; as 2 : 4 : : 8 : 16 ; that is, as 2 to 4, so is 8 to 16. ^/ Prefixed to any number, supposes that the square root of that number is required....

Daboll's Schoolmaster's Assistant: Improved and Enlarged. Being a Plain ...

Nathan Daboll - 1837 - 246 σελίδες
...thus, J=4, each of which signify the same tiling. : : Four points set in the middle of four nn.Tibrtrs. denote them to be proportional to one another, by the rule of three ; as 2 : 4 : : 8 : 10; that is, as 2 to 4, so is Ц to 1Ü. i/ Prefixed to any number, supposes that the square root...

A complete treatise on practical land-surveying

Thomas Holliday - 1838 - 404 σελίδες
...equal, (. as 3 feet = J yard ; or 22 yards = 1 chain. f the sign of proportion, as 2 : 4 : : 8 : 16, "'t that is, as 2 is to 4, so is 8 to 16. ('the sign 2 or 3 placed above a quantity denotes the 4 2 , 4 3 , -? square or cube of that quantity,...

Arithmetic. [With] Key, Τόμος 1

Robert Goodacre - 1839 - 320 σελίδες
...multiplied by 2 = 10. -r- divided by; as, 10 -r 2 = 5. that is, 10 divided by 2 = 5. ; :: : Proportion; as, 2 : 4 : : 8 : 16, that is, as 2 is to 4, so is 8 to 16. ( ) denotes a parenthesis ; [ ] denotes a crochet ; and -{ Y denotes a brace. These signs are made...




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