small bag of sugar weighs (1/8) kilograms, and a large bag of sugar weighs (4/8) kilograms. What fraction of a kilogram is a small bag of sugar lighter than a large bag of sugar?
一小袋糖重(1/8)千克，一大袋糖重(4/8)千克，一小袋糖比一大袋糖轻几分之几千克？
<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/2) - (1/8)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>