 | Seymour Eaton - 1892 - 252 pages
...multiple of two or more numbers is the least number that is exactly divisible by each of them. Any number is divisible by 3 if the sum of its digits is divisible by S. Any number is divisible by 4 if it end with two or more ciphers, or if the number expressed by its... | |
 | George Albert Wentworth, Thomas Hill - Arithmetic - 1893 - 392 pages
...itself a prime number. The several divisors and the last quotient are the prime factors required. 222. The following tests are very useful for determining...digits is divisible by 3. 5. A number is divisible by 9 (3s) if the sum of its digits is divisible by 9. 6. A number is divisible by 5 if its last digit... | |
 | Webster Wells - Arithmetic - 1893 - 360 pages
...hence, V. Any number is divisible by 10 if its last digit is 0. Thus, 3790 is divisible by 10. VI. Any number is divisible by 3 if the sum of its digits is divisible by 3. Thus, 582 is divisible by 3, because the sum of its digits, 15, is divisible by 3. VII. Any number... | |
 | Eugene L. Dubbs - Arithmetic - 1893 - 244 pages
...the Iy. CM of 8, 12, and 16. Any number is divisible by 2 if it ends with o, or 2, 4, 6, or 8. Any number is divisible by 3 if the sum of its digits is divisible by 3. Thus, 357 is divisible by 3, because 3+5+7, or 15, is divisible by 3. Any number is divisible by 4... | |
 | 1893 - 252 pages
...etc., respectively. Any 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... | |
 | George Albert Wentworth - Arithmetic - 1895 - 432 pages
...number is divisible by 2 if its last, or right hand, digit is even. 2. A number is divisible by 4 (2*) if the number denoted by the last two digits is divisible...digits is divisible by 3. 5. A number is divisible by 9 (3s) if the sum of its digits is divisible by 9. 6. A number is divisible by 5 if its last digit... | |
 | George Albert Wentworth - Arithmetic - 1895 - 548 pages
...A number is divisible by 4 (2?) if the number denoted by the last two digits is divisible by 4, 8. A number is divisible by 8 (2s) if the number denoted...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 by 5 if its last digit... | |
 | George Albert Wentworth - Arithmetic - 1895 - 392 pages
...3. A number ia divisible by 8 (2*) if the number denoted Vy the last three digits is divisible by &. 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 by 5 if its last digit... | |
 | Horatio Nelson Robinson - Arithmetic - 1895 - 526 pages
...it 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). The part which... | |
 | Edwin Pliny Seaver, George Augustus Walton - Arithmetic - 1895 - 412 pages
...determined by the following tests: 1. A number is divisible by 2 if the units are divisible by 2. 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... | |
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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 by 5 if its last digit is either 5 or 0. 
