128 sf is 14.2 sq yards.
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100 SF or 34 Sq. Yards
6.02 cubic yards. Order 6-1/2 if they'll let you to be safe. SF x depth / 27 = cubic yards. 650 x .25 (3" is .25 of 1 ft) / 27 = 6.02 cy.
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.
4300 x .66 * = 2838 cubic feet / 27 = 105.11 cubic yards. ( *.66 = 8" )
3.27 x 2.35 = 25.128315 Any of those numbers can be rounded to any number of significant figures (SF) both before and after the multiplication. We just need to know how many SF you would like.