 A number is divisible by 3 if the sum of its digits is divisible by 3• A number is divisible by 9 if the sum of its digits is divisible by 9.  Arithmetic - Σελίδα 20των Jacob William Albert Young - 1905Πλήρης προβολή - Σχετικά με αυτό το βιβλίο
 | 1893 - 252 σελίδες
...number is divisible by 4 when the two right-hand digits are divisible by 4. Any number is divisible by 3 if the sum of its digits is divisible by 3. 131. To aid the pupil in determining the prime factors of a composite number the following table is... | |
 | 1898 - 956 σελίδες
...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 divisible by 4.... | |
 | Horatio Nelson Robinson - 1895 - 526 σελίδες
...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). The part which... | |
 | 1898 - 670 σελίδες
...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 divisible by 4.... | |
 | Edwin Pliny Seaver, George Augustus Walton - 1895 - 412 σελίδες
...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 -6 86427 = -j... | |
 | George Albert Wentworth - 1898 - 424 σελίδες
...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 divisible by 3.... | |
 | George Albert Wentworth - 1898 - 424 σελίδες
...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 divisible by 3.... | |
 | George Albert Wentworth - 1898 - 424 σελίδες
...by 8 (23) 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 divisible by 3.... | |
 | George Edward Atwood - 1901 - 158 σελίδες
...number that is not exactly divisible by 2 ; as, 7, 11, 19, 33. 35. Any number is exactly divisible : By 3, if the sum of its digits is divisible by 3 ; as, 738, 825, 804, 498, 888. By 4, if the number expressed by its two right-hand digits is divisible... | |
 | Eugene L. Dubbs - 1901 - 462 σελίδες
...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 number is divisible... | |
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