Xiaoting measured that 10 sheets of paper are 1 mm thick, and the "Dictionary for Primary School Students" is about 4 cm thick. How many sheets do you estimate that "Dictionary for Primary School Students" contains?
小婷测量出10张纸有1毫米厚，《小学生字典》厚约4厘米，你估计《小学生字典》有多少张纸．
<gadget id="calculator">10 * 4 * 10</gadget>
<output>400</output>

<result>400</result>