A centimetre is 10 millimetres, so 1 square centimetre contains 10 rows of 10 squares, each 1 square millimetre in area. This works out to a total of 100.
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1cm=10mm Therefore, 1cm2=100mm2 Then,10cm2=1000mm2
1 sq km = 1,000,000,000,000 sq mm
510. There are 10mm in one cm.
6.3 cm = 63 mm
1 mm is 1/10 of a cm, so 1 mm2 is 1/100 of a cm2.