304.8 mm in a foot
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304.8 mm = 1 ft (exactly) → 280 mm = 280 / 304.8 ft ≈ 0.92 ft (≈ 11 inches)
30 x 45 what? inches, mm's. trick question :) If simply feet, length times width. 30sq. ft. x 45sq. ft. = 1350sq. ft.
25.4 mm = 1 inch; four ft, 7 in = 55 in; multiply 25.4 by 55 to solve: 25.4 x 55 = 1397 mm
150 sq ft = 13.94 sq metres, approx. That area would require 68.8 or 69 slabs. However, this assumes that the area to be covered is "well-behaved" and that wastage is kept to a minimum.