To find 19 + (11+37), Lennie added 19 and 11. Then he added 37 to the sum. What property did he use ?
2 answers:
Lennie used the associative property.
The associative property basically shows that in any order the parenthesis are grouped, you will get the same number.
For example: 19+(11+37)= (19+11)+37=67
19 + (11+37) = (19 + 11) + 37
Associative property of addition
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