Well, one 12 ft * 12 ft paver will cover 144 sq feet so one will be enough.
On the other hand, if they were 12 centimetres by 12 centimetres then you would need 133781 pavers.
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144.63 pavers
Any reason why it shouldn't be 220, apart from the shape of the area?
4.5 pavers will cover 1 sq foot. So 4.5 x 360 =1620 pavers
If each paver is 6 x 3 then it has an area of 18 square feet. You will need exactly 25 of these to cover an area of 450 square feet.
1 square foot = 144 square inches100 square feet = 14,400 square inches8-in x 4-in = 32 square inches14,400/32 = 450 pavers