That usually means that you change the parentheses, when several numbers are added, or multiplied. For example,
(1 + 2) + 3 = 1 + (2 + 3)
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No
Associative property
Regroup was created in 2006.
0, 1, 2, 3 and 4
Regroup? Seriously? It is convert! 81*100=8100