Hope Primary School made red flowers to celebrate "Six Day" Children's Day. There are 6 grades in the school, each grade has 3 classes, each class made 45 flowers, how many flowers did the six grades make in total?
希望小学为庆"六一"儿童节做红花．学校共有6个年级，每个年级3个班，每班做了45朵花，六个年级一共做了多少朵花？
<gadget id="calculator">3 * 6 * 45</gadget>
<output>810</output>

<result>810</result>