The students donated money to the disaster-stricken areas in Sichuan. The fourth grade donated 450 yuan, and the fifth grade donated three times as much as the fourth grade. How much more did the fifth grade donate than the fourth grade?
同学们为四川灾区捐款，四年级捐款450元，五年级捐的钱数是四年级捐的3倍，五年级比四年级多捐款多少元？
<gadget id="calculator">450 * 3</gadget>
<output>1_350</output>

<gadget id="calculator">1_350 - 450</gadget>
<output>900</output>

<result>900</result>