If a 400 cm long wooden strip is to be sawed into 20 cm long pieces, how many times does it need to be sawed?
一根400厘米长的木条，要锯成20厘米长的小段，需要锯几次？
<gadget id="calculator">400 / 20</gadget>
<output>20</output>

<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<result>19</result>