[Avodah] Kama Maalot Tovot Lamakom Aleinu?

[AES]

>>>In the Hagaddah, we go through the math of how many makkot there were in
mitzrayim and at the yam suf. We say that since each maka in mitzrayim was
an "etzba" and at the yam suf it was a "yad" that there were 5X as many
plagues at the yam than in Egypt.>>>

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This reminds me of the following question that I heard from R'
Reisman:  a finger is not one-fifth of a hand, because a hand includes
the palm - so, in reality, a finger is probably closer to only
one-tenth of a hand - so why is the Haggadah talking about a finger
being one-fifth of a hand?

IIRC, R' Reisman answered in the name of the Chasam Sofer that when
chazal speak about a "yad," they are really only referring to the
fingers and not the palm.  We see this from the fact that one is
yotzei netilas yadayim when one washes only the fingers (and not the
palm) (as we do on Tisha B'Av and Yom Kippur) and from the fact that
we call what the kohanim do during duchening as "nesias kapayim" and
not "nesias yadayim" since they lift their fingers *and* their palms
when they duchen.

KT,
Aryeh