5th Grade math

What is a partial-products algorithm. For example 87*65=? How do you do it and show your work?

Here is how Chicago Math does it:

87
x65

multiply 80 x 60.....4800
multiply 7 x 60..... 420
multiply 5 x 80.......400
multlply 5 x 7 ........35

add the products.

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asked by Nick

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