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" Any number is divisible by 9, when the sum of its digits is divisible by 9; "
Pounds, shillings and pence: or, A series of money calculations on a novel ... - Page 7
by T. Martin - 1842
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The Elements of Algebra: Designed for the Use of Students in the University

John Hind - Algebra - 1837 - 539 pages
...subtracted, the remainder is always divisible by r — 1. In the common scale of notation, a number is always divisible by 9, when the sum of its digits is divisible by 9: and any number and the sum of its digits, when divided Ijy 9, leave the same remainder. 352. COK. From...
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Higher Arithmetic: Designed for the Use of High Schools, Academies, and Colleges

George Roberts Perkins - Arithmetic - 1841 - 252 pages
...+ 8+7 by 6 + 5 + 4 ? INTERESTING PROPERTIES OF NUMBERS. PROPOSITION I. 5. Every number will divide by 9, when the sum of its digits is divisible by 9. For, take any number as 78534; this number is, by the nature of decimal arithmetic, the same as 70000+8000...
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Higher Arithmetic: Designed for the Use of High Schools, Academies, and ...

George Roberts Perkins - Arithmetic - 1849 - 342 pages
...What is the product of 1+7+5 by 2 + 3? SINGULAR PROPERTY OF THE FIGURE 9. S. Every number will divide by 9, when the sum of its digits is divisible by 9. For, take any number, as 78534; this number is, by the nature of decimal arithmetic, the same as 70000+...
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HIGHER ARITHMETIC

GEORGE R. PERKINS A.M., - 1849
...the product of 1 + 7 + 5 by 2 + 3 ? SINGULAR PROPERTY OF THE FIGURE 9. &. Every number will divide by 9, when the sum of its digits is divisible by 9. For, take any number, as 78534 ; this number is, by the nature of decimal arithmetic, the same as 70000+...
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Higher Arithmetic: Designed for the Use of High Schools, Academies, and ...

George Roberts Perkins - Arithmetic - 1850 - 342 pages
...is the product of 1+7 + 5 by 2 + 3? SINGULAR PROPERTY OF THE FIGURE 0. 5. Every number will divide by 9, when the sum of its digits is divisible by 9. For, take any number, as 78534; this number is, by the nature of decimal arithmetic, the same as 70000+...
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Higher Arithmetic: Designed for the Use of High Schools, Academies, and ...

George Roberts Perkins - Arithmetic - 1851 - 342 pages
...is the product of 1 +7 + 5 by 2+3 ? SINGULAR PROPERTY OF THE FIGURE 9. 5. Every number will divide by 9, when the sum of its digits is divisible by 9. For, take any number, as 78534; this number is, by the nature of decimal arithmetic, the same as 70000+...
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The Practical Arithmetic: Designed for Such Institutions as Require a ...

George Roberts Perkins - Arithmetic - 1855 - 356 pages
...together with the 6 units, will exactly divide by 9, the whole number is divisible by 9 ; that is, a number, is divisible by 9 when the sum of its digits is divisible by 9. The same will be true of 3, since 3 is a divisor of 9 ; that is, a number is divisible by 3 when the...
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Algebra

Isaac Todhunter - Algebra - 1858 - 496 pages
...divisible by 3. For example, 111, 252, and 7851 are divisible by 3. 446. It appears from Art. 443 that a number is divisible by 9 when the sum of its digits is divisible by 9; and that when any number is divided by 9, the remainder is the same as if the sum of the digits of...
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Algebra

Isaac Todhunter - 1860 - 516 pages
...divisible by 3. For example, 111, 252, and 7851 are divisible by 3. 446. It appears from Art. 443 that a number is divisible by 9 when the sum of its digits is divisible by 9; and that when any number is divided by 9, the remainder is the same as if the sum of the digits of...
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The Common School Arithmetic: Combining Analysis and Synthesis; Adapted to ...

James Stewart Eaton - 1862
...What number is divisible by 2? By 8? 4! 6? 6? What is eaid of 7? What number is divisible by 8? (g) Any number is divisible by 9 when the sum of its digits is divisible by 9; thus, 7146 is divisible by 9 because the sum of its digits, 7 -f- 1 -4- 4 -4- 6 = 18, is divisible...
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