If you are looking for an area, then the unit used would be square millimetres, not millimetres. However, units are not specified in the question, therefore, the two units are incompatible.
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1 inch = 25.4 mm ("mm" = millimeter) thererfore, 5 inches = 127.0 mm and it follows that .. 5 x 5 inches (25 square inches) = 127.0 x 127.0 mm = 16,129 square millimeters
1 m = 1000 mm 5 m = 5 x 1000 = 5000 mm
relevant answer: 25
25
the pairs are 1 x 25 5 x 5