The teacher uses a piece of red cloth with a length of 4 meters and a width of 2 meters to make an isosceles right-angled triangle red flag with a side length of 4 decimeters. How many small pennants can be made at most?
老师用一块长4米，宽2米的红布做直角边长是4分米的等腰直角三角形红旗，最多可以做多少面小三角旗？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">0.4 * 0.4</gadget>
<output>0.16</output>

<gadget id="calculator">8 / 0.16</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<result>100</result>