6 yuan and 4 jiao are expressed as decimals.
6元4角用小数表示是多少元．
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) + 6</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>