Did you happen to enable RPN Mode (View menu)?<p>That lists operands followed by operators so you end up typing the numbers before you specify what to do with them.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Reverse_Polish_notation" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Reverse_Polish_notation</a>