First you need to tell us what the units of your 8x4 blocks are. For example, feet, or inches.
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100
You will need at least 67 tiles. This will cover 150.75 square feet.
We only need length times width to calculate area. Half a foot by 10 feet = 5 square feet. You'd need 60 of them to cover 300 square feet.
You will need 7.1 square yards of fabric.
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