The partial product is 420.
We can write 15 as (10+5).
It means [tex]28*15 =28(10+5) = (28*10) + (28*5).[/tex]
[tex]28*10=280\\28*5=140[/tex]
So, [tex]28*15=280+140=420[/tex]
The partial product is 420.
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