Divide 1 meter into 100 parts on average, 1 part is 1 meter ((())/(())), 21 cm is 1 meter ((())/(())) that is ((()) /(())) meters, how many meters can also be written.
把1米平均分成100份，1份是1米的((())/(()))，21厘米是1米的((())/(()))也就是((())/(()))米，还可以写成多少米．
<gadget id="calculator">100 / 1</gadget>
<output>100</output>

<gadget id="calculator">21 / 100</gadget>
<output>21/100 = around 0.21</output>

<result>21/100 = around 0.21</result>