 | 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
...from the Latin digitut, 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. NOTE. Every number divisible by 9 is divisible by 3 ; bat not every number divisible by 3 is divisible... | |
 | Malcolm MacVicar - 1876 - 412 σελίδες
...digits is 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 - 1878 - 380 σελίδες
...divisible by 2 is an even number; a number that is not divisible by 2 is an odd number. 2. A number is divisible by 3 if the sum of its digits* is divisible by 3. Thus, 285 is divisible by 3, for 2 + 8 + 5 = 15 is divisible by 3. 3. A number is divisible by 4 if... | |
 | Edwin Pliny Seaver, George Augustus Walton - 1879 - 330 σελίδες
...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 S. 14. The Greatest Common Factor of Numbers (Art. 175). The method of finding the gcf of numbers,... | |
 | George Albert Wentworth, Thomas Hill - 1881 - 446 σελίδες
...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 9 (32) if the sum of its digits is divisible by 9. 6. A number is divisible... | |
 | 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,... | |
 | 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
...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 9 (32) if the sum of its digits is divisible by 9. ' 6. A number is divisible... | |
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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. 
