Answer :

#2.

640,739 = 600,000 + 40,000 + 0 + 700 + 30 + 9

#3.

102,453 = 100,000 + 0 + 2,000 + 400 + 50 + 3

#4.

460,053 = 400,000 + 60,000 + 0 + 0 + 50 + 3

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