On July 1, 2011, Beijing Tiantianmen Square took on a new look to celebrate the 90th anniversary of the founding of the Communist Party of China. Mingming's family drove to visit Tiananmen Square. It is known that his home is 900 kilometers away from the square, and the car consumes 5 liters of fuel every 100 kilometers. At least how many liters of gasoline do you need to drive from home to Tiananmen Square?
2011年7月1日，北京天空门广场焕然一新，庆祝建党90周年．明明一家开车去天安门广场参观，已知他家距广场900千米，汽车每行驶100千米耗油5升．至少要耗多少升汽油才可以从家开到天安门广场？
<gadget id="calculator">900 / 100</gadget>
<output>9</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>