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To find 19+11+37 lennie added 19 and 11 then be added 37 to the sum .what property did he use ?

To find 19+11+37 lennie added 19 and 11 then be added 37 to the sum .what property-example-1

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about 67 because you add them all up and your answer should be 67
User Radomeit
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