If you rounded to the nearest hundred, you could do 7300 x 600, so your estimated guess would be 4,380,000.
The actual answer is 4,612,336.
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it is a method of estimation used in school e.g 698,656,675,689=700,700,700,700next step is to multiply 700 X 4=2800
4 x 0.05 = 0.2
40 x 5 = 200
4*5 = 20 so the answer should be around 20.
6 x 3 = 18