There can be no equivalence.
A gram is a measure of mass 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, any attempt at conversion from one to the other is fundamentally flawed.
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1 sq in = 6.452 sq cm
70 sq cm = 0.007 sq metres.
20 sq cm = 20*100 sq mm = 2000 sq mm
45 sq metres / 50 sq cm = 450000 sq cm / 50 sq cm = 9000 tiles.
1 in = 2.54 cm (exactly) 1 sq in = 1 in x 1 in = 2.54 cm x 2.54 cm = 6.4516 sq cm ⇒ 4 sq in = 4 x 6.4516 sq cm = 25.8064 sq cm ≈ 25.81 sq cm