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96475
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There is no such number. You can add 456000 or 456878322168000 or even 1581687671173873681773618733111
It is 634. 9-3 = 6 9-6 = 3 9-5 = 4 365 +634 =999 No regrouping required.
I take this question to mean what number when added to 457 will yield 999. In this case it is 542.