Yeast for 2.5 gallons

Forgive me if this is a dumb question, or been addressed already.

If I’m doing a 2.5 gallon batch, do I also cut my yeast in half since the packets are usually for 5 gallon?  Thanks.

Check the pitching rate at Mrmalty.com and pitch at the correct rate.  If that’s less than a full pack then pitch less than the full pack.

That’s awesome… thanks!