49
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64 squared gives 4,096
25 squared is 625; the square root of 625 = 25
The square root of 156.
49m * 49 m = 2401 m2 200 mm * 100 mm = 20,000 mm2 = 0.02 m2 So number of blocks = 2401/0.02 = 120,050
2401 x 2401 = 49 x 49 x 49 x 49 = 5,764,801