8400 is a pure number, with no units associated so it is impossible to answer the question in a sensible way.
0.84 m is very much smaller than 8400 kilometres but very much larger than 8400 nanometres!
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Is < Less than or Greater than or > Greater than or Less than
It is 8400 to the nearest hundred because 19 is less than 50
It is > for less than and < for greater than.
The greater than sign is ">" and the less than sign is "<"
Its less than