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Anonymous
The answer depends on the degree to which you are estimating. To the nearest thousand it is 1 thousand; to the nearest hundred, it is 600 and so on.
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638 x 34 = 21,692
638 kilograms = 22,504.8 ounces
The number 638 in Roman numerals is DCXXXVIII
6.38 = 638/100 or 319/50 in fraction
106.3333