What is the correct apostrophe use in the sentence below? Should there be an apostrophe in IQ's?

The race is not always won by the swift, nor do achievement and success always accrue to those with the nimblest wits and the highest IQ's.

Here's another one:

After a few handshakes and hello's, I saw Frank.

Should there be an apostrophe in hello's?

Thank you.

I just answered this in your 'Guest' posting, CN-- please see that one for details. No apostrophe for a plural, only for possessives.
Thank you for taking the time to answer.

I thought the same, it just seemed to look odd, especially the "hellos".