 | Jacob Henry Minick, Clement Carrington Gaines - Business mathematics - 1904 - 412 pages
...are ciphers, or express a number divisible by 8. Thus, 2000, 3168, 5256, etc., are divisible by 8. 7. By 9, if the sum of the digits is divisible by 9. Thus, 63, 135, 342, etc., are divisible by 9. 8. By 10, if the unit figure is 0. 9. By 25, if the two... | |
 | Samuel Hamilton - Arithmetic - 1907 - 286 pages
...numbers divisible by 9? Divide by 9 other numbers the sum of whose digits is divisible by 9. A number is divisible by 9, if the sum of the digits is divisible by 9. 5. State which of the following numbers are divisible by 2; by 5; by 3; by 9 : 6. 10 9. 135 12. 400... | |
 | James S. Sweet - Business mathematics - 1907 - 268 pages
...is divisible by 2 and 3. 6. By 8 if the three right hand digits express a number divisible by 8. 7. By 9 if the sum of the digits is divisible by 9. 8. By 10 if the number ends in 0. 9. By 12 if the number is divisible by 3 and 4. 10. By 15 if the... | |
 | Wilbur Fisk Nichols - Algebra - 1911 - 268 pages
...divisible by 2. By 3, if the sum of the digits is divisible by 3. By 5, if the units' figure is 0 or 5. By 9, if the sum of the digits is divisible by 9. Find the prime factors of 132. 9} 1 49 What prime number will divide 132 ? Dividing by 2, ¿ До-j... | |
 | Paul Klapper - Arithmetic - 1916 - 404 pages
...rule (2) applies. (6) A number is divisible by 8 if the last 3 digits are divisible by 8. (7) A number is divisible by 9 if the sum of the digits is divisible by 9. Multiples and Factors.—Their Importance.—A knowledge of multiples is necessary in all reductions... | |
 | George Wentworth, David Eugene Smith - Arithmetic - 1919 - 268 pages
...2743: 2000 = 2 x 999 + 2 700 = 7 x 99 + 7 40 = 4 x 9 + 4 _3 = 3 2743 = (multiples of 9)+ 2 + 7 + 4 + 3 14. In Ex. 13 show that 2743 is divisible by 9 if...mentally which of these products are incorrect : 15. 687 x 87,147= 52,985,379. 18. II 3 = 1341. 16. 22.2 x 307.05 = 6836.51. 19. 114 = 14,641. Check of... | |
 | Jacob Orleans - Games & Activities - 1987 - 292 pages
...any even number divisible by 3; by 8: if the number formed by the last 3 digits is divisible by 8; by 9; if the sum of the digits is divisible by 9 6. When x is 1 more than y. For example, if x — 7 and y = 6, then x + y = 1 3 and x - y = I ; and... | |
 | James T. Glover - Juvenile Nonfiction - 2001 - 304 pages
...related because 3x3-9. The divisibility rules for 3 and 9 are also similar to one another. A number is divisible by 9 if the sum of the digits is divisible by 9. In relation to digital roots a number is divisible by 9 if its digital root is 9. The digital root... | |
 | M. J. Tipler - Juvenile Nonfiction - 2004 - 468 pages
...Multiply out the /I <mj^^" ~t brackets and then simplify. *3 Prove this statement. Any three-digit number is divisible by 9 if the sum of the digits is divisible by 9. Review Carlota noticed that all of the two-digit numbers where the tens digit is equal to the units... | |
 | Ken Johnson, Ted Herr, Judy Kysh - Mathematics - 2003 - 506 pages
...because the number composed by the last three digits, 544, is divisible by 8. Divisibility by 9: A number is divisible by 9 if the sum of the digits is divisible by 9. Example: 1,264,873,920,921 is divisible by 9 because the sum of the digits is 1 + 2 + 6 + 4 + 8 + 7... | |
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A number is divisible by 9 if the sum of the digits is divisible by 9. 
