Divisibility Rules

Test Preparation
1

<p>This is from Wikipedia. I find it extremely useful for those number property questions of the SATs.</p>

<pre><code>* a number is divisible by 2 iff the last digit is divisible by 2
* a number is divisible by 3 iff the sum of its digits is divisible by 3
* a number is divisible by 4 iff the number given by the last two digits is divisible by 4
* a number is divisible by 5 iff the last digit is 0 or 5
* a number is divisible by 6 iff it is divisible by 2 and by 3
* a number is divisible by 7 iff the result of subtracting twice the last digit from the number with the last digit removed is divisible by 7 (e.g. 364 is divisible by 7 since 36-2
</code></pre>

2

<p>Thank you for posting those. I have never heard all of the rules together before, and was planning on finding them out before I retake the SAT.</p>

<p>Since they are from Wikipedia, which can be unreliable, can someone confirm all of them?</p>

3

<p>this looks awesome. thanks!</p>