Xiaoqiang and Xiaoli multiply the same number by 35 and 42 respectively, and Xiaoli is right, the product is 630. Xiaoqiang made a mistake in his calculation. The product he calculated was 100 less than the correct one. What is the result of Xiaoqiang's calculation.
小强和小丽分别用35和42去乘同一个数，小丽算得对，积是630．小强算错了，他算的积比正确的少了100，小强算出的结果是多少．
<gadget id="calculator">630 / 42</gadget>
<output>15</output>

<gadget id="calculator">35 * 15</gadget>
<output>525</output>

<gadget id="calculator">525 - 100</gadget>
<output>425</output>

<result>425</result>