None, since there can be no conversion.
A centimetre (cm) is a measure of length in 1-dimensional space while a square metre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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1 meter = 100 cm (1 m x 1 m) = 1 square meter = (100 cm x 100 cm) = 10,000 square cm 1 square cm = 1/10,000 = 0.0001 square meter
1 sq metre = 1 m x 1 m = 100 cm x 100 cm = 10000 sq cm.
10 000
0.10 cm2 * * * * * No! 1 mm = 0.1 cm so 1 sq mm = 0.1*0.1 = 0.01 sq cm
1 sq metre = 1 m * 1 m = 100 cm * 100 cm = 10000 cm2