Since 49 is a factor of 98, it is automatically the GCF.
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The GCF is 7.
The greatest possible error is 49. 147, rounded to the nearest 98 is 98 with an error of 49. Similarly, 49.0...1, rounded to the nearest 98 is 98 with an error of 48.999... recurring.
The greatest common factor of the numbers 5, 98 and 198 is 1.
The factors of 98: 1, 2, 7, 14, 49, 98
Since 49 is a factor of 343, it is automatically the GCF.