To round to the nearest thousand, the two numbers in their thousands, on either side of 18627 are:18000 which is at a distance of 18627 - 18000 = 627, and19000 which is at a distance of 19000 - 18627 = 373.The smaller of these is 373 and so the nearest 1000 is 19000.
600
600
630
0.627 = 627/1000
627/1000
736 to the nearest 1000, is 1000.
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1000