There is no equivalence.
A millimetre is a measure of length or distance in 1-dimensional space while a square centimetre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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There are 100 millimeters in a square centimeter, since a centimeter is equal to 10 millimeters and area calculations involve squaring the unit of measurement.
There are 100 square millimeters in a square centimeter. This is because a square centimeter is 10 millimeters by 10 millimeters, giving a total of 100 square millimeters.
There are 10 millimeters in a centimeter.
There are 10 millimeters in one centimeter.
1 cm = 10 mm, so 1 cm2 = 100 mm2 Technically, the correct answer is 10, because the question asks about centimeter square and millimeters square, not square cenitimeter and square millimeters.
20 x 25 millimeters is equal to 500 square millimeters. To convert this into square centimeters, you divide by 100 (since 1 centimeter is 10 millimeters). Therefore, 500 square millimeters is equal to 5 square centimeters.