Assuming you are referring to 16 by 16 feet,
16 sqrd = 256
453/256 = 1.77 blocks.
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if it is 16in by 16in blocks then 426 to 427 blocks if it is 16ft by 16ft blocks then just 1. You will haveto cut part of the block tho and move it to the open space.
Assuming they are 8 inch*16 inch blocks, 144 square feet = 144*12*12 square inches. So number of blocks required = 144*12*12/(8*16) = 162
253.125 blocks.
A 16in x 16 in block has an area of 16*16 sq inches = 16/9 sq feet. To cover 196 sq ft you will require a minimum of 196/(16/9) = 196*16/9 = 110.25 blocks, that is 111 blocks. However, this assumes that the area is well behaved and that almost all offcuts are used. In real life that is a very unrealistic assumption and you should allow at least 5% for wastage.
225 of them.