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Example 2.45 from Prealgebra, 2.4 Find Multiples and Factors
Determine whether is divisible by
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Table 2.12 applies the divisibility tests to and tests the results by finding the quotients.
| Divisible by…? | Test | Divisible? | Check |
|---|---|---|---|
| Is last digit No. | no | ||
Yes. |
yes | ||
| Is last digit is or Yes. | yes | ||
| Is last digit No. | no |
Thus, is divisible by and but not or
The book's Try It right after this example: same idea, new numbers. Only the answer is given.
Determine whether the given number is divisible
How did it go?