The first radical of this word is guttural; this affects the adjacent vowels.
Singular
Plural
Absolute State
חֲמִשָּה ~ חמישה
chamisha
five m.
חָמֵש
chamesh
five f.
Conjugate State
חֲמֵשֶת
chameshet
(the) five m. of
חֲמֵש
chamesh
(the) five f. of
Masculine
Feminine
Person
חֲמִשְתֵּנוּ
chamishtenu
the five of us
חֲמִשְתְּכֶם
chamishtechem
the five of you m. pl.
חֲמִשְתְּכֶן
chamishtechen
the five of you f. pl.
חֲמִשְתָּם
chamishtam
the five of them m.
חֲמִשְתָּן
chamishtan
the five of them f.
1st Person
חֲמִשְתֵּנוּ
chamishtenu
the five of us
2nd Person
Masculine
חֲמִשְתְּכֶם
chamishtechem
the five of you m. pl.
Feminine
חֲמִשְתְּכֶן
chamishtechen
the five of you f. pl.
3rd Person
Masculine
חֲמִשְתָּם
chamishtam
the five of them m.
Feminine
חֲמִשְתָּן
chamishtan
the five of them f.