One million mm.
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400 mm x 400 mm = 0.4 m * 0.4 m = 0.16 sq metres. So 1 metre squared contains 1/0.16 = 6.25400 mm x 400 mm = 0.4 m * 0.4 m = 0.16 sq metres. So 1 metre squared contains 1/0.16 = 6.25400 mm x 400 mm = 0.4 m * 0.4 m = 0.16 sq metres. So 1 metre squared contains 1/0.16 = 6.25400 mm x 400 mm = 0.4 m * 0.4 m = 0.16 sq metres. So 1 metre squared contains 1/0.16 = 6.25
100
1 cm squared is 10mm by 10mm so 1cm squared equals 100mm squared
1 m = 1,000 mm 800 m = 800,000 mm
Since 1 mm = 0.001 m, it follows that 1 square mm = 0.000 001 square meters. This number is 0.001 squared.