mostly, they help compare variables to number, other variables, or a combination of both numbers and variables. They're mainly used with this block:
<( <=> )>
and with the If block, the If-Else block, the Repeat Until block, the Forever If Block, and the Wait Until block.
<set{ X }to( 5 )>
<if><( <{ X }> <=> 5 )>
Do this
<end>
The <pick random( )to( )> is exactly what is says.
(( <mod> )) finds the remainder (e.g. 8 mod 3 = 2)
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If you're talking about the numbers category, the name has been changed to 'operators.' MoreGamesNow seems to have a pretty good description of most of these blocks. You can read more about this category and the blocks in it here.
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Thanks Karakou, wiki is much more complete.
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