1, 2, 19, 38
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
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38/60
you can findthe common factors 20 - 1, 2, 4, 5, 10 ,20 22 - 1, 2, 11, 22 38 - 1, 2, 19, 38 60 - 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 1 and 2 are the only common factors in all four numbers. the greatest common factor is 2
2 and 19 are the prime factors of 38
19 words / 38 seconds = x words / 60 seconds 19 / 38 = x / 60 19 * 60 / 38 = x 30 = x 30 words.
factors of 35 are 1,5,7,35 factors of 38 are 1,2,19,38 therefore the gcf of 35 and 38 is 1.