From the examples you cited, it seems like you want to move each number to the nearest multiple of 50.
This function should do the following:
=ROUND(C629 / 50 , 0) * 50
This works as follows for 129 :
- 129/50 = 2.58
- ROUND (2.58, 0) = 3
- 3 * 50 = 150
EDIT: An OP comment for using inline MROUND is a much better idea.
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