 | 1898 - 956 σελίδες
...to be added. 2. 2.5X.25X.025X-25=.00390625. 3. Numbers ending in 2, 4, 6, 8, 0 are divisible by 2. A number is divisible by 3 if the sum of its digits is divisible by 3. A number is divisible by 4 when the number denoted by its two right hand digits is... | |
 | Horatio Nelson Robinson - 1895 - 526 σελίδες
...follows also that every number is an exact number of 9's plus the sum of its digits (§ 77). XI. A number is divisible by 3 if the sum of its digits is divisible by 3. For every number is an exact number of 9's plus the sum of its digits (X and § 77).... | |
 | Edwin Pliny Seaver, George Augustus Walton - 1895 - 412 σελίδες
...above, the first part is divisible by 3. The other part is equal to the sum of its digits. Hence a number is divisible by 3 if the sum of its digits is divisible by 3. 4. Divisibility of numbers by 11. ILLUSTRATION. 80000 = 7272 x 11 + 8 6000= 546 x 11... | |
 | George Albert Wentworth - 1898 - 424 σελίδες
...number is divisible by 8 (2s) if the number denoted by the last three digits is divisible by 8. 4. A number is divisible by 3 if the sum of its digits is divisible by 3. 5. A number is divisible by 6 if its last digit is even and the sum of its digits is... | |
 | George Albert Wentworth - 1898 - 424 σελίδες
...number is divisible by 8 (2 3 ) if the number denoted by the last three digits is divisible by 8. 4. A number is divisible by 3 if the sum of its digits is divisible by 3. 5. A number is divisible by 6 if its last digit is even and the sum of its digits is... | |
 | George Albert Wentworth - 1898 - 424 σελίδες
...number is divisible by 8 (2s) if the number denoted by the last three digits is divisible by 8. 4. A number is divisible by 3 if the sum of its digits is divisible by 3. 5. A number is divisible by 6 if its last digit is even and the sum of its digits is... | |
 | Adelia Roberts Hornbrook - 1900 - 428 σελίδες
...Find the sum of the digits of each of them, and see if that sum is a multiple of 3. PRINCIPLE 4. A number is divisible by 3 if the sum of its digits is a multiple of 3. 122. Tell at sight which of the following numbers are not divisible by 3, and give... | |
 | Eugene L. Dubbs - 1901 - 462 σελίδες
...numbers into their prime factors. 1. Every even number is divisible by 2 ; as 4, 6, 8, 10, etc. 2. A number is divisible by 3 if the sum. of its digits is divisible by 3. Thus, 1752 is divisible by 3, because 1 + 7 + 5 + 2, or 15, is divisible by 3. 3. A... | |
 | William Estabrook Chancellor - 1901 - 154 σελίδες
...divisible by 2. Then 12, 16, 18, 152, 374, are divisible by 2, because 6, 8, 2, and 4 can be divided by 2. Any number is divisible by 3 if the sum of its digits, or figures, is divisible by 3. 474 can be divided by 3, for its digits, added together, make a sum,... | |
 | William James Milne - 1902 - 620 σελίδες
...the decimal system (a) Any number is divisible by 9, if the sum of its digits is divisible by 9. (b) Any number is divisible by 3, if the sum of its digits is divisible ЬуЗ. (c) Any even number is divisible by 6, if the sum of its digits is divinible by 3.... | |
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A number is divisible by 3 if the sum of its digits is divisible by 3. 
