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Associative property of multiplication
The way in which three numbers are grouped
when they are multiplied doesn't change the
product.

Example  2 (4 x 5) = 4 (5 x 2)

The way in which 3 numbers are grouped when they are added
doesn't change the sum

example ( 1 + 2 ) + 4 = 2 + ( 1 + 4 )