1,000s Added: 1773 + ? = 5773, 3623 + ? = 8623, 2051 + ? = 4051, 100s Added: 325 + ? = 625, 435 + ? = 935, 142 + ? = 742, 10s Added: 617 + ? = 657, 860 + ? = 880, 519 + ? = 589,

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