The greatest common divisor of 14 and 21 is their least common multiple.
14和21的最大公约数是它们最小公倍数的多少．
<gadget id="calculator">7 * 2 * 3</gadget>
<output>42</output>

<gadget id="calculator">7 / 42</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>