| Mathematics - 1836 - 366 pages
...metre which is one ten-millionth part of a fourth of its circumference. 237. A number is divisible by 9, if the sum of its digits is divisible by 9 ; and by 1 1, if the sum of the 1st, 3rd, 5th .... digits is equal to the sum of the 2nd, 4th, 6th,... | |
| James Stewart Eaton - Arithmetic - 1857 - 376 pages
...-f- 4 -f- 3 is the sum of the digits which express the number 5G43 ; hence any number is divisible by 9 if the sum of its digits is divisible by 9. • If the sum of the digits of a number divided by 9 give a remainder, then the number itself divided... | |
| Horatio Nelson Robinson - Arithmetic - 1860 - 444 pages
...sum, or the entire number, is divisible_by the same power of 5, (135, II). IX. A number is divisible by 9 if the sum of its digits is divisible by 9. For, if any number, as 7245, be separated into its parts, 7000 + 200 + 40+5, and each part be divided... | |
| George Augustus Walton - Arithmetic - 1864 - 364 pages
...number. The following principles are derived directly from Art. 511 : — 513. Any number is divisible by 9, if the sum of its digits is divisible by 9. •113. If any number is divided by 9, the remainder is equal to the remainder when the sum of its... | |
| George Augustus Walton - Arithmetic - 1864 - 376 pages
...number. Thi> following principles are derived directly from Art 511 : — «512. Any number is divisible by 9, if the sum of its digits is divisible by 9. •5 1 Íí . If any number is divided by 9, the remainder is equal to the remainder when the sum of... | |
| Samuel H. Winter - 1864 - 348 pages
...shot in the bottom course. 11. Solve the equations i.ax ~,„ ~ 12. Prove that a number is divisible by 9, if the sum of its digits is divisible by 9. 13. Find the present value of £1 due 12 years hence, money bearing 4£ per cent. compound interest.... | |
| Howard Candler - 1868 - 132 pages
...further object in view of explaining the principle of the " chain rule." NOTE D. A number is divisible by 9, if the sum of its digits is divisible by 9. Take the numbers 45678. 45678 = 40000 4- 5000 + 600 + 70 + 8 = 4 (9999 + i) + 5 (999 + i) + 6 (99 +... | |
| Adolf Sonnenschein - 1873 - 194 pages
...divisible by 9. Note that 27 = the sum of the digits in 153576. Learn by heart : A number is divisible by 9 if the sum of its digits* is divisible by 9. (/) Eeasoning analogous to that just given shews that any number is an exact number of nines + the... | |
| Daniel W. Fish - Arithmetic - 1874 - 542 pages
...are ciphers, or express a number divisible by 8. Thus, 3000, 2728, and 10576 are divisible by 8. 7. By 9, if the sum of its digits is divisible by 9. Thus, 217683 and 401301 are divisible by 9. 8. By 10, if it ends with one or more ciphers. Thus, 40,... | |
| Lorenzo Fairbanks - 1875 - 472 pages
...exact divisor. By 8, if its three right-hand figures are ciphers, or express a number which is exactly divisible by 8. By 9, if the sum of its digits is divisible by 9. EXAMPLES FOR PRACTICE. 1. Find the prime factors of 31570. 2. Find the prime factors Of 2S665. 3. What... | |
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