Dylan is evaluating the expression 13 plus 19 plus 7 plus 10 At one step in his work, Dylan rewrites the equation as 13 plus 7 plus 19 plus 10 Which property of addition must Dylan have used when he evaluated the expression?

Dylan changed the order of the addends from 13 + 19 + 7 + 10 to 13 + 7 + 19 + 10, swapping 19 and 7. The commutative property of addition says that changing the order of addends does not change the sum, so the answer is the commutative property.

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