 | Edwin Pliny Seaver, George Augustus Walton - Arithmetic - 1895 - 444 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... | |
 | Education - 1898 - 956 pages
...are 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 divisible by 4.... | |
 | Education - 1898 - 670 pages
...are 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 divisible by 4.... | |
 | 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 - Arithmetic - 1895 - 408 pages
...be 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 uivisible by 3. Thus, 285 is divisible by 3, for 2 + 8 + 5 = 15 is divisible by 3. 3. A number is divisible... | |
 | George Albert Wentworth - Arithmetic - 1898 - 424 pages
...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 divisible by 3.... | |
 | George Albert Wentworth - 1898 - 424 pages
...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 divisible by 3.... | |
 | George Albert Wentworth - Arithmetic - 1898 - 424 pages
...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 divisible by 3.... | |
 | W. H. F. Henry - Questions and answers - 1899 - 440 pages
...an even digit or 0, and odd if it ends with an odd digit. 107. When is a number divisible by 3 f Any number is divisible by 3, if the sum of its digits is so divisible, and not otherwise. DEM. — (1) There is no digit that may not be produced in the right-hand... | |
 | Adelia Roberts Hornbrook - Arithmetic - 1900 - 428 pages
...36. 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... | |
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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. 
