Approximately 90%
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38 * 42 = 1,596
-4
The LCM of 38 and 42 is: 798
The factors of 42 are 1, 2, 3, 6, 7, 14, 21 and 42. The factors of 38 are 1, 2, 19 and 38. 2 is the greatest factor which divides both 38 and 42. So, the GCF of 42 and 38 is 2.
Percentage of 8 out of 38 is about 21.05%.