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Because with addition the order doesn't matter; this is an example of the commutative property where a + b is the same as b + a
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456 plus what equals 1242.\
123 + 456 + 7890 = 8469
456 + 312 = 768
66 + 456 = 522
456 plus 100 is equal to 556
898 + 456 = 1354
777568 + 456 = 778024
789 + 456 = 1245
4002 + 456 = 4458
456 + 789 + 123 + 123456789 = 123458157
456 + 656 = 1,112