round to the first significant figure
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The number cannot be 64 when rounded to 1 sf.
There is no such thing as a nearest significant figure. For sf (as with decimal places) it is necessary to specify how many. 0.00747 to 1 sf is 0.007, to 2 sf it is 0.0075, to 3 sf it is 0.00747, to 4 sf it is 0.007470 and so on.
No, to three sf.
128 sf is 14.2 sq yards.
It would round up to 1.