problems with TRUNC

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Hi,

I seem to be having trouble with the TRUNC formula!

In the same worksheet i have used it many times but some seem to give the incorrect answer...but all the settings are the same as the one that works!

the formula is =TRUNC(W152/60)

where in this case W152 is 180.

in some of the cells the result of =TRUNC(180/60) = 3

in the ones which are not working the result is 2.9999999999999

Any ideas? all the formulas and cell settings are identical!