كَمْ asks about number or expresses a large amount.
كَذَا stands for an amount or statement left unspecified.
Added example: «كَمْ كِتَابًا قَرَأْتَ؟» — How many books did you read?
«عِنْدِي كَذَا كِتَابًا» leaves the exact quantity unspecified.
This is an added teaching example, not a quotation from the book.
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Al-Kināyāt — Kam, its Tamyīz and Syntactic Positions
كَمْ asks about number or expresses a large amount.
كَذَا stands for an amount or statement left unspecified.
Added example: «كَمْ كِتَابًا قَرَأْتَ؟» — How many books did you read?
«عِنْدِي كَذَا كِتَابًا» leaves the exact quantity unspecified.
This is an added teaching example, not a quotation from the book.