How would you use estimation to evaluate this expression: 10.2 × [(2×3.7)+8]

Well, first you would estimate all the terms: 10.2 to 10, 2 to 2(keep the same), 3.7 to 4, and eight to eight.

So you have 10 x [(2 x 4) + 8]
then you would evaluate this expression using order of operations
 
10 x [(2 x 4) + 8]
10 x [8 +  8] 
10 x 16
160