The front end estimate is 600. But estimating a single number, in isolation and without context, is a complete waste of time. If I had to add 558 to 1 trillion, I would estimate it as 0. If I had to add 558 to 0.0000000001, I would use the number as given - not use an estimate.
Also, if I had to divide 558 by 5, I would estimate it as 560 since 560/5 = 112 whereas if I had to divide it by 30 I would go for 570 since 570/30 = 19.
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The BEST estimate can only be 2852.831 anything else is not BEST.
17.77
an estimate is near enough, this answer is correct - 161.02
14
To the nearest integer, 23