The front end estimate is 1000. But estimating a single number, in isolation and without context, is a complete waste of time. If I had to add 1374 to 1 trillion, I would estimate it as 0. If I had to add 1374 to 0.0000000001, I would use the number as given - not use an estimate.
Also,if I had to calculate 1374/13 I might estimate it by 1365 because 1365/13 = 105 can be calculated mentally.
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To the nearest ten, 1370
To the nearest hundred, 1400
To the nearest thousand, 1000
900 would be a fair estimate
You could estimate is as 0.5
The closest estimate is the exact answer. For any other estimate, you can always get closer.
over-estimate
The answer depends on what you wish to do with the number.For 53.54/9 I would estimate it as 54. For 53.54*62 I would estimate it as 55.