Sure. The idea o an estimate is "best guess" based on available data
Yes, it can.
It is an estimate that is quite safe
The estimate for 15,772 is 10,000
An upper bound estimate is a estimate that is greater than the actual solution.
It could estimate to 480 or even 500, depending on what way you want to estimate it to.
The front end estimate is 600.
1x504=504 2x252=504 3x168=504 4x126=504 6x84=504 7x72=504 8x63=504 9x56=504 12x42=504 14x36=504 18x28=504 21x24=504
998 + 504 + 504 + 504 = 2510
504 = 504/1
The LCM is: 504
The LCM is: 504
504 x 504
5.04 or 504%
The LCM is: 504
504 9*56 = 504 8*63 = 504
28
No, but 504 is divisible by 2.
504, 1008, 1512 and so on.