By unit of length and distance and conversion ,we can say that
1 m=100 cm
1.50 m=150 cm
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1.5 m = 150 cm
A 30 m by 30 m square. Each of the tiles is 20 cm by 20 cm [20 cm = 0.20 m]. So 30 m / 0.20 m = 150. So you need 150 x 150 = 22500 tiles
150 cm * 140 cm = 1.5 m * 1.4 m = 2.1 sq m
Since one km = 1000 m and one cm = 0.01 meter, 150 cm = 150(0.01 m)/[1000 (m/km)], or (150 X 10-2/1000) km = 1.50 X 10-3 km.
It is 1.5 m because 145 cm = 1.45 m1.5 m equals 150 cm which is greater than 145 cm