Subtract by adding.
Example: 673,493 - 2,763 = 670,730
Add 7 to 3 to get 2,770
(0 + 7) = 7
Add 30 to 2,770 to get 2,800
(7 + 30) = 37
Add 200 to 2,800 to get 3,000
(200 + 37) = 237
Add 7,000 to 3,000 to get 10,000
(7,000 + 237) = 7,237
Add 90,000 to 10,000 to get 100,000
(90,000 + 7,237) = 97,237
Add 573,000 to 100,000 to get 673,000
(573,000 + 97,237) = 670,237
Add 493 to 673,000 to get 673,493
(493 + 670,237) = 670, 730
Final Answer: 630,730
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