 | William Steadman Aldis - Algebra - 1887 - 616 pages
...number in the decimal scale is divisible by 3 if the sum of its digits is so divisible. 18. Shew that a number is divisible by 8 if the number formed by its last three digits is so divisible. 19. The square of every number is of the form 3m+ 1 or 3m; and the square of every prime... | |
 | Henry Sinclair Hall, Samuel Ratcliffe Knight - Algebra - 1891 - 606 pages
...scale in which the radix is greater than seven. 33. Prove that in the ordinary scale a number will be divisible by 8 if the number formed by its last three digits is divisible by eight. 34. Prove that the square of rrrr in the scale of * is m-jOOOl, where q, r, s are any three... | |
 | Webster Wells - Arithmetic - 1893 - 382 pages
...divisible by 4, because 68 is divisible by 4. Any number of thousands is divisible by 8 ; hence, III. Any number is divisible by 8 if the number formed by its last three digits is divisible by 8. Thus, 47352 is divisible by 8, because 352 is divisible by 8. Any number of tens is divisible by 5... | |
 | Webster Wells - Arithmetic - 1893 - 360 pages
...divisible by 11. 57. 1. Find the prime factors of 51480. 51480 is divisible by 8, or 2 s , because the number formed by its last three digits is divisible by 8 (Art. 56, III). Dividing 51480 by 8, the quotient is 6435. 6435 is divisible by 5, because its last... | |
 | George Washington Hull - Arithmetic - 1895 - 404 pages
...digits is divisible by 4. By 5 if its right-hand figure is 5 or 0. By 6 if it is divisible by 2 and 3. By 8 if the number formed by its last three digits is divisible by 8. By 9 if the sum of its digits is divisible by 9. By 10 if the right-hand figure is 0. 13-21. Tell by... | |
 | George Washington Hull - Arithmetic - 1895 - 408 pages
...digits is divisible by 4. By 5 if its right-hand figure is 5 or 0. By 6 if it is divisible by 2 and 3. By 8 if the number formed by its last three digits is divisible bt/ 8. By 9 if the sum of its digits is divisible by 9. By 10 if the right-hand figure is 0. 13-21.... | |
 | Helen Abbot Merrill - Algebra - 1917 - 282 pages
...by 4 or 25, when the number formed by its last two digits is divisible by 4 or 25 ; by 8 or 125 when the number formed by its last three digits is divisible by 8 or 125, etc. 28. Factorials. The product 1 • 2 • 3 ••• n is of such frequent occurrence in mathematical... | |
 | David Wells - Mathematics - 1997 - 260 pages
...any other, in 12 essentially different ways. 8 times any triangular number is 1 less than a square. A number is divisible by 8 if the number formed by its last 3 digits is divisible by 8. The second octagonal number, given by the formula «(3« - 2). The sequence... | |
 | S. Shirali - Number theory - 2001 - 176 pages
...102 are indivisible by 8, whereas 103 is divisible by 8, we see that a number is divisible by 8 iff the number formed by its last three digits is divisible by 8. Divisibility by 16 Since 103 is indivisible by 16, whereas 104 is divisible by 16, we see that a number... | |
 | Geoff Martz, Kim Magloire, Theodore Silver - Education - 2005 - 554 pages
...divisible by 6 because it is even (divisible by 2) and the sum of its digits is divisible by 3. 6. A number is divisible by 8 if the number formed by its last three digits (hundreds, tens, and unit digits) is also divisible by 8. Thus, 9,128 is divisible by 8 because 128... | |
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By 8 if the number formed by its last three digits is divisible by 8. 
