you will need at least 28, (1.2mx0.6m=0.72m^2, 20/0.72=27.7) assuming they fir the way you want them to, i would get a two or three extra depending on the exact shape of the area you want to fill.
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it is like a fill in the blank
1210
112 cuft
5,290 Pieces
6x6 square would make 36 square units of space. Each 2x2 square would fit in a 4 square unit space. So therefore, you would need 9 2x2 squares to fill a 6x6 grid.