I don't have an answer yet!
The way I really understand it, is that its estimating by the highest place value, not a very close estimation, but still around the number.
A reasonable estimate will give an indication of the order of magnitude of the number. The order of magnitude is determined by the decimal point and so knowing the order can help in placing it.
The magnitude estimate for 12.2 multiplied by 1.56 is approximately 19.03.
1000
The order of magnitude for 15 is 1. -Apex.
OOM (Order of magnitude) estimate
The way I really understand it, is that its estimating by the highest place value, not a very close estimation, but still around the number.
It is a million.
It is a bit confusing. An order of magnitude is a factor of 10, but an order of magnitude estimate is more like a factor of 3, or the square root of 10. In some cases it is simply a "ball park" estimate. For example if a company give an order of magnitude estimate for a major construction project of 10,000,000 dollars, it could be anywhere from 3 million to 30 million, but usually it means roughly 10,000,000, give or take a few million.
It is tens of thousands.
Tens of thousands.
Estimating help determine the order of magnitude of the answer. It is, therefore, a simple matter to place the decimal point is such a way that the order of magnitude of the calculated answer matches that of the estimate.
Apparently a magnitude estimate is just a estimate just closer to the actual answer.
A reasonable estimate will give an indication of the order of magnitude of the number. The order of magnitude is determined by the decimal point and so knowing the order can help in placing it.
Their magnitude is ten thousands.
The magnitude estimate for 12.2 multiplied by 1.56 is approximately 19.03.
The order of magnitude is "tens".