[Avodah] ashtei-asar

[saul newman via Avodah]

could someone explain please the ibn ezra in last weeks  parsha ?

someone asked about the origin of  'ashtei'  and noted the this week
mikshah  is  translated as eshet---   which  must mean one solid piece so
 that must mean ashtei= one  . but why not say achad asar ?      [ he
 pointed out that 'eshet'= 770 , a number of  completion ]
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