1 million
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(1 metre) squared = (1000 mm) squared = 1000000 mm squared.
Since a centimeter is 10 millimeters, it follows that a square centimeter is equal to 102 = 100 square millimeters.
To find out how many 20mm x 20mm squares fit in a square meter, first convert square meters to square millimeters. One square meter equals 1,000,000 square millimeters. Each 20mm x 20mm square has an area of 400 square millimeters. Dividing 1,000,000 by 400 gives you 2,500, so there are 2,500 of these squares in a square meter.
10,000
There are 1000 millimeters in 1 Meter.