College Algebra / Unit 1 Alg 015 short lesson, about 20 seconds
The Associative Properties
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The idea
The associative properties say grouping does not change a sum or a product: (a + b) + c = a + (b + c), and (ab)c = a(bc).
In practice
(2 + 3) + 5 and 2 + (3 + 5) both reach 10; the parentheses moved and nothing else did.
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