Since the exact answer is 1.61, 2 is larger than 1.61 and hence an overestimate.
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It's an overestimate. The actual total is 1.61
160 by estimate
There is no need to estimate when the exact answer is so easy to find. 55*2 = (50 + 5)*2 = 50*2 + 5*2 = 100 + 10 = 110
The estimate is 1.
6+2=8