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Carol Fisher's Homepage Table of Contents for "One Mathematical Cat, Please!" See the best ALGEBRA PINBALL time for this exercise |
| DIVISIBILITY BY 2 If a number ends in 0, 2, 4, 6, or 8, then the number is divisible by 2. Also, if a number is divisible by 2, then it ends in 0, 2, 4, 6, or 8. |
| DIVISIBILITY BY 3 To decide if a number is divisible by 3, add up the digits in the number. Continue this process of adding the digits until you get a manageable number. (If you want, keep going until you get a single-digit number.) If this final number is divisible by 3, then the number you started with is also divisible by 3. If this final number is not divisible by 3, then the number you started with is not divisible by 3. |
| DIVISIBILITY BY 5 If a number ends in 0 or 5, then the number is divisible by 5. Also, if a number is divisible by 5, then it ends in 0 or 5. |
| DIVISIBILITY BY 10 If a number ends in 0, then the number is divisible by 10. Also, if a number is divisible by 10, then it ends in 0. |
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One Mathematical Cat, Please! A First Course in Algebra © 20042008 Carol J.V. Fisher |
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