 | Eugene L. Dubbs - 1893 - 244 σελίδες
...its last 3 digits is divisible by 8. Thus, 4112 is divisible by 8, because 112 is divisible by 8. Any number is divisible by 9 if the sum of its digits is divisible by 9. Thus, 2574 is divisible by 9, because 2 jf- 5 jf 7 -f- 4, or 18, is divisible by 9. LESSON II. Find... | |
 | Webster Wells - 1893 - 382 σελίδες
...an even number, and the sum of its digits is divisible by 3. This follows from I and VI. VIII. Any number is divisible by 9 if the sum of its digits is divisible by 9. Thus, 864 is divisible by 9, because fhe sum of its digits, 18, is divisible by 9. IX. Any number is... | |
 | Edwin Pliny Seaver - 1895 - 450 σελίδες
...hundreds, tens, and units together are divisible by 8. Thus, 6728 is divisible by 8, while 6724 is not. 7. A number is divisible by 9 if the sum of its digits is divisible by 9. 8. A number is divisible by 11 if the sums of its alternate digits are equal, or if their difference... | |
 | George Washington Hull - 1895 - 404 σελίδες
...if it is divisible by 2 and 3. By 8 if the number formed by its last three digits is divisible by 8. By 9 if the sum of its digits is divisible by 9. By 10 if the right-hand figure is 0. 13-21. Tell by inspection which of the following numbers are exactly... | |
 | James Alexander McLellan, Albert Flintoft Ames - 1897 - 368 σελίδες
...overtakes A in 4 hr. Walking on, B arrives at Q 2 hr. before A. Find the distance from P to Q. 243. A number is divisible by 9 if the sum of its digits is divisible by 9. Why? 244. At what two times between 3 and 4 o'clock are the hands of a watch equally distant from the... | |
 | James Alexander McLellan, Albert Flintoft Ames - 1897 - 368 σελίδες
...overtakes A in 4 hr. Walking on, B arrives at Q 2 hr. before A. Find the distance from P to Q. 243. A number is divisible by 9 if the sum of its digits is divisible by 9. Why ? 244. At what two times between 3 and 4 o'clock are the hands of a watch equally distant from... | |
 | Wilbur Fisk Nichols - 1898 - 152 σελίδες
...is 5 or 0. By 6, if it is divisible by 2 and 3. By 8, if the last three figures are divisible by 8. By 9, if the sum of its digits is divisible by 9. 13. Find the prime factors of 210. What prime number will divide 210? Divide by 2. What 2 ) 210 is... | |
 | W. H. F. Henry - 1899 - 440 σελίδες
...divisible by 8, and not otherwise. (Demonstration similar to 108.) 113. W hen divisible by 9 f Any number is divisible by 9 if the sum of its digits is so divisible, and not otherwise. (For Demonstration, see Answer to Question 99, page 198.) 114. When... | |
 | Wilbur Fisk Nichols - 1899 - 174 σελίδες
...is 5 or 0. By 6, if it is divisible by 2 and 3. By 8, if the last three figures are divisible by 8. By 9, if the sum of its digits is divisible by 9. 13. Find the prime factors of 210. What prime number will divide 210 ? Divide by 2. What 2 ) 210 i8... | |
 | Eugene L. Dubbs - 1901 - 462 σελίδες
...expressed by its three right-hand figures is divisible by 8, or if it ends with three or more ciphers. 4. A number is divisible by 9, if the sum of its digits is divisible by 9. 78. To separate a composite number into its prime factors. What are the prime factors of 66 ? OPERATION... | |
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A number is divisible by 9 if the sum of its digits is divisible by 9. 
