Question 1112479
<br>
I will assume you mean the smaller blocks are similar to the original.  "singular" has no meaning; "similar" makes a reasonable math problem.<br>
In any two similar figures, if the ratio of linear measurements (scale factor) is a:b, then the ratio of area measurements is a^2:b^2, and the ratio of volume measurements is a^3:b^3.<br>
In this problem, we know the ratio of volumes is 1:8; that means the scale factor is 1:2, and the ratio of areas is 1:4.  So if the surface area of each of the smaller blocks is 1.2 square meters, then the surface area of the original block is 4*1.2 = 4.8 square meters.