 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
 | James Hamblin Smith - 1870 - 452 σελίδες
...what scale is 5 1 1 1 73 written 572640 ? 7. Shew that a number in the Common scale is divisible : (1) by 3 if the sum of its digits is divisible by 3. (2) by 4 if the last two digits be divisible by 4. (3) by 8 if the last three digits be divisible by... | |
 | Adolf Sonnenschein - 1873 - 194 σελίδες
...Latin diyitus, a finger, the fingers being the natural counters. Learn by heart : A number is divisible by 3 if the sum of its digits is divisible by 3. NOTB. Every number divisible by 9 is divisible by 3 ; but not every number divisible by 3 is divisible... | |
 | Malcolm MacVicar - 1876 - 412 σελίδες
...divisible by 9, the number 486 is divisible by 9 (Prop. II). PROP. XI. — Any number is divisible by 3, if the sum of its digits is divisible by 3. This proposition is shown in the same manner as Prop. X ; as 3 divides 10, 100, 1000, etc., with a... | |
 | Horatio Nelson Robinson - 1877 - 250 σελίδες
...number is divisible L By 2, if it is an even number. Thus, 20, 24, 36, and 44 are divisible by 2. 2. By 3, if the sum of its digits is divisible by 3. Thus, 135,471, and 1134 are divisible by 3. 3. By 4, if its two right-hand figures are ciphers, or... | |
 | Edwin Pliny Seaver, George Augustus Walton - 1878 - 364 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. 14. The Greatest Common Factor of Numbers (Art 175). The method of finding the gcf of numbers, as given... | |
 | Joseph Ficklin - 1881 - 406 σελίδες
...138. Any number is exactly divisible 1. By 2, if it ends with a cipher or a digit divisible by 2. 2. By 3, if the sum of its digits is divisible by 3. 3. By 4, if the number expressed by the two figures on the right is exactly divisible by 4. 4. By 5,... | |
 | George Albert Wentworth, Thomas Hill - 1881 - 446 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 9 (32) if the sum of its digits is divisible by 9. 6. A number is divisible... | |
 | Silas Sadler Packard, Byron Horton - 1882 - 324 σελίδες
...without a remainder. Any number is divisible 1. By 2, if it is an even number ; ae 6, 28, and 32. 2. By 3, if the sum of its digits is divisible by 3 ; as 849 (8 + 4 + 9 = 21, 21 is divisible by 3), 7323, and 47892. 3. By 4, if the two right-hand figures... | |
 | George Albert Wentworth, Thomas Hill - 1882 - 376 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 9 (32) if the sum of its digits is divisible by 9. ' 6. A number is divisible... | |
 | Emerson Elbridge White - 1883 - 370 σελίδες
...is even. 2. A number is divisible by 5 if its last digit is either 5 or 0. 3. A number is divisible by 3 if the sum of its digits is divisible by 3. 4. If any prime number be divided- by 6, the remainder will be either- 1 or 5. .NOTE.—The best way... | |
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