The Cayman trough has an elevation of -7\dfrac{7}{10}−7
10
7

minus, 7, start fraction, 7, divided by, 10, end fraction kilometers. The Mariana trench has an elevation of -10\dfrac{9}{10}−10
10
9

minus, 10, start fraction, 9, divided by, 10, end fraction kilometers. Note that both places have negative elevations because they are below sea level.
Drag the white cards onto the gray rectangle to write an inequality that correctly compares the elevations.