<p><pre><code>    16x180
    ...
    = 288
</code></pre>
I think he overestimates the capabilities of himself.<p>He also misidentified the tricky part of the problem as multiplication and addition. Holding intermediate place values is far more likely to cause issues, as we can see from his mistake.<p>If we allow for simple mistakes, everyone here can do that multiplication in their head without issue. But that was babuskov&#x27;s exact point. Calculators help with silly mistakes of this sort and they&#x27;re present nearly everywhere.