1.0 link Rainbow Dash Network http://rainbowdash.net/ Toothpaste Pony! (minti) http://rainbowdash.net/minti http://rainbowdash.net/notice/2485214 #<span class="tag"><a href="http://rainbowdash.net/tag/uselessinfo" rel="tag">uselessinfo</a></span> You can easily get the remainder of any division by nine in your head, just calculate the numbers digital root and that's the answer. &quot;The digital root (also repeated digital sum) of a number is the (single digit) value obtained by an iterative process of summing digits, on each iteration using the result from the previous iteration to compute a digit sum. The process continues until a single-digit number is reached. For example, the digital root of 65,536 is 7, because 6+5+5+3+6 = 25 and &lt;math&gt;2+5 = 7.&quot; If you get 9 as the root, the remainder is 0. So basically, the remainder of 65,536 / 9 is 7. Neat, huh?