Check which operator makes the equation true: 20 __ 2 = 18.<br><br>
&bull; 20 + 2 = 22 &rarr; too large<br>
&bull; 20 &minus; 2 = 18 &rarr; correct<br>
&bull; 20 x 2 = 40 &rarr; too large<br>
&bull; 20 &divide; 2 = 10 &rarr; too small<br><br>
Final Answer: B: &minus;