David Megginson<p>Solving <strong>2×2=4</strong> is the <a href="https://mstdn.ca/tags/HelloWorld" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HelloWorld</span></a> for any slide rule with the basic D and C scales, including the <a href="https://mstdn.ca/tags/CardboardComputer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CardboardComputer</span></a>:</p><ol><li><p>Adjust the wheels (or slide) to put 2 above 1</p></li><li><p>Keeping the alignment, read 4 over 2.</p></li></ol><p>Not so hard, was it? There's a lot of unnecessary mystification around <a href="https://mstdn.ca/tags/slideRules" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>slideRules</span></a>, but they're simple tools at heart.</p><p>You can also try this with the online simulator at <a href="https://cardboard-computer.org" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">cardboard-computer.org</span><span class="invisible"></span></a></p><p><a href="https://mstdn.ca/tags/DiY" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DiY</span></a></p>