Q: What is 21x12?

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252 ft squared

I'm assuming 21x12 are in inches.21 x 12 inches = 252 Inches1 square foot = 144 Inches650 x 144 = 93 600 Inches Squared93 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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252 ft squared

Multiply the two dimensions to get the area. The calculation will give you 252 square feet which converts to 28 square yards.

I'm assuming 21x12 are in inches.21 x 12 inches = 252 Inches1 square foot = 144 Inches650 x 144 = 93 600 Inches Squared93 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 :)

The multiples of 21 up to 500 are as follows: 21x1=21 21x2=42 21x3=63 21x4=84 21x5=105 21x6=126 21x7=147 21x8=168 21x9=189 21x10=210 21x11=231 21x12=252 21x13=273 21x14=294 21x15=315 21x16=336 21x17=357 21x18=378 21x19=399 21x20=420 21x21=441 21x22=462 21x23=483 21x24=504