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I'm assuming 21x12 are in inches.

21 x 12 inches = 252 Inches

1 square foot = 144 Inches

650 x 144 = 93 600 Inches Squared

93 600 / 252 =

95.3809524or rounding off 96 tiles. You may have a gap with no tiles on one or two walls or you can fill the gap with a split tile.

Hope this helps :)

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Q: How many tiles 21x12 need to cover 650 square foot?
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